diff --git a/polymer/eduke32/source/gameexec.c b/polymer/eduke32/source/gameexec.c
index 062b540a6..b2088b2f4 100644
--- a/polymer/eduke32/source/gameexec.c
+++ b/polymer/eduke32/source/gameexec.c
@@ -656,7 +656,7 @@ dead:
     if (movflags&getv) vm.g_sp->zvel += ((*(moveptr+1)<<4)-vm.g_sp->zvel)>>1;
 #else
     if (movflags&geth) vm.g_sp->xvel += (actor[vm.g_i].mv.hvel - vm.g_sp->xvel)>>1;
-    if (movflags&getv) vm.g_sp->zvel += (actor[vm.g_i].mv.vvel - vm.g_sp->zvel)>>1;
+    if (movflags&getv) vm.g_sp->zvel += (16*actor[vm.g_i].mv.vvel - vm.g_sp->zvel)>>1;
 #endif
 
     if (movflags&dodgebullet && !deadflag)
diff --git a/polymer/eduke32/source/lunatic/control.lua b/polymer/eduke32/source/lunatic/control.lua
index 935948a2e..946833059 100644
--- a/polymer/eduke32/source/lunatic/control.lua
+++ b/polymer/eduke32/source/lunatic/control.lua
@@ -174,6 +174,7 @@ local check_tile_idx = bcheck.tile_idx
 local check_sprite_idx = bcheck.sprite_idx
 local check_player_idx = bcheck.player_idx
 local check_sound_idx = bcheck.sound_idx
+local check_number = bcheck.number
 local check_type = bcheck.type
 
 -- Will contain [<label>]=number mappings after CON translation.
@@ -184,7 +185,7 @@ local function krandand(mask)
     return bit.band(ffiC.krand(), mask)
 end
 
-local function check_isnumber(...)
+local function check_allnumbers(...)
     local vals = {...}
     for i=1,#vals do
         assert(type(vals[i])=="number")
@@ -261,7 +262,7 @@ function insertsprite(tab_or_tilenum, ...)
 
     check_tile_idx(tilenum)
     check_sector_idx(sectnum)
-    check_isnumber(shade, xrepeat, yrepeat, ang, xvel, zvel, owner)
+    check_allnumbers(shade, xrepeat, yrepeat, ang, xvel, zvel, owner)
 
     if (statnum >= ffiC.MAXSTATUS+0ULL) then
         error("invalid 'statnum' argument to insertsprite: must be a status number (0 .. MAXSTATUS-1)", 2)
@@ -999,11 +1000,6 @@ function _A_IncurDamage(sn)
     return ffiC.A_IncurDamage(sn)
 end
 
-function _VM_FallSprite(i)
-    check_sprite_idx(i)
-    CF.VM_FallSprite(i)
-end
-
 function _sizeto(i, xr, yr)
     local spr = sprite[i]
     local dr = (xr-spr.xrepeat)
@@ -1895,16 +1891,9 @@ end
 
 -- Common serialization function for gamearray and actorvar.
 local function serialize_array(ar, strtab, maxnum)
---    if (ffiC._DEBUG_LUNATIC ~= 0) then
-        -- Iterate in numeric order. XXX: also for non-debug?
-        for i=0,maxnum-1 do
-            serialize_value(strtab, i, rawget(ar, i))
-        end
---    else
---        for i,v in pairs(ar) do
---            serialize_value(strtab, i, v)
---        end
---    end
+    for i=0,maxnum-1 do
+        serialize_value(strtab, i, rawget(ar, i))
+    end
 
     strtab[#strtab+1] = "})"
 
@@ -2076,8 +2065,8 @@ local gamearray_methods = {
     _get_require = our_get_require,
 
     _serialize = function(gar)
-        local strtab = { "_ga(", tostring(gar._size), ",{" }
         gar:_cleanup()
+        local strtab = { "_ga(", tostring(gar._size), ",{" }
         return serialize_array(gar, strtab, gar._size)
     end,
 }
@@ -2137,7 +2126,7 @@ end
 local actorvar_methods = {
     --- Internal routines ---
 
-    --  * All values for sprite not in the game world are cleared.
+    --  * All values for sprites not in the game world are cleared.
     --  * All values equal to the default one are cleared.
     _cleanup = function(acv)
         for i=0,ffiC.MAXSPRITES-1 do
@@ -2156,10 +2145,10 @@ local actorvar_methods = {
     _get_require = our_get_require,
 
     _serialize = function(acv)
-        local strtab = { "_av(", tostring(acv._defval), ",{" }
         -- NOTE: We also clean up when spawning a sprite, too. (See
         -- A_ResetVars() and related functions above.)
         acv:_cleanup()
+        local strtab = { "_av(", tostring(acv._defval), ",{" }
         return serialize_array(acv, strtab, ffiC.MAXSPRITES)
     end,
 }
@@ -2177,6 +2166,7 @@ local actorvar_mt = {
 
     __newindex = function(acv, idx, val)
         check_sprite_idx(idx)
+        check_number(val)
         rawset(acv, idx, val)
     end,
 
@@ -2216,6 +2206,7 @@ local playervar_mt = {
 
     __newindex = function(plv, idx, val)
         check_player_idx(idx)
+        check_number(val)
         rawset(plv, idx, val)
     end,
 
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index 06c7332d4..1a41f25b0 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -850,6 +850,11 @@ do
     }
 end
 
+function actor_static_members.fall(i)
+    check_sprite_idx(i)
+    CF.VM_FallSprite(i)
+end
+
 -- Delete sprite with index <i>.
 function actor_static_members.delete(i)
     check_sprite_idx(i)
@@ -1052,7 +1057,8 @@ local actor_mt = {
             oa:set_action(ai.act)
             oa:set_move(ai.mov, ai.movflags)
 
-            a.t_data[0] = 0
+            -- Already reset with set_move():
+--            a.t_data[0] = 0
         end,
 
         has_ai = function(a, ai)
@@ -1215,8 +1221,7 @@ local player_mt = {
             end
         end,
 
-        -- XXX: is the correct spelling "whack"?
-        wack = function(p, no_return_to_center)
+        whack = function(p, no_return_to_center)
             p.horiz = p.horiz + 64
             if (not no_return_to_center) then
                 p.return_to_center = 9
diff --git a/polymer/eduke32/source/lunatic/lunacon.lua b/polymer/eduke32/source/lunatic/lunacon.lua
index e5359ec0f..d745d8ca0 100644
--- a/polymer/eduke32/source/lunatic/lunacon.lua
+++ b/polymer/eduke32/source/lunatic/lunacon.lua
@@ -783,6 +783,8 @@ local function check_reserved_bits(flags, allowedbits, suffix)
     end
 end
 
+Define.ALLOWED_VIEWTYPE = truetab { 0, 1, 3,4, 5, 7, 8, -5, -7 }
+
 function Define.composite(labeltype, identifier, ...)
     local oldtype = g_labeltype[identifier]
     local oldval = g_labeldef[identifier]
@@ -821,6 +823,20 @@ function Define.composite(labeltype, identifier, ...)
         check_reserved_bits(args[LABEL.AI], 4096+2047, "for ai's movflags")
     end
 
+    if (labeltype == LABEL.ACTION) then
+        -- Sanity-check action members.
+        -- TODO: con.action(), too.
+        if (not (args[2] >= 0)) then
+            errprintf("action \"%s\" has negative number of frames", identifier)
+        end
+        if (Define.ALLOWED_VIEWTYPE[args[3]] == nil) then
+            errprintf("action \"%s\" has disallowed viewtype %d", identifier, args[3])
+        end
+        if (not (args[4] >= -1 and args[4] <= 1)) then
+            warnprintf("action \"%s\" has incval different from -1, 0 or 1", identifier)
+        end
+    end
+
     -- Make a string out of that.
     for i=1+(isai and 2 or 0),#args do
         args[i] = format("%d", args[i])
@@ -2247,7 +2263,7 @@ local Cinner = {
         / "_con._shoot(_aci,%2,%1)",
 
     fall = cmd()
-        / "_con._VM_FallSprite(_aci)",
+        / "actor.fall(_aci)",
     flash = cmd()
         / format("_con._flash(%s,%s)", SPS"", PLS""),
     getlastpal = cmd()
@@ -2275,7 +2291,7 @@ local Cinner = {
     tossweapon = cmd()
         / "",  -- TODO_MP
     wackplayer = cmd()
-        / PLS":wack()",
+        / PLS":whack()",
 
     -- player/sprite searching
     findplayer = cmd(W)
diff --git a/polymer/eduke32/source/lunatic/test.elua b/polymer/eduke32/source/lunatic/test.elua
index 5d2fea726..29657b9e5 100644
--- a/polymer/eduke32/source/lunatic/test.elua
+++ b/polymer/eduke32/source/lunatic/test.elua
@@ -473,8 +473,13 @@ gameactor
         local a = actor[aci]
         local delay = math.sin(0.1 * 2*math.pi*gv.totalclock/120)
         a:set_action_delay(20 + 10*delay)
-        a:set_hvel(50*delay)
-        a.movflags = actor.MOVFLAGS.geth
+        if (sprite[aci].pal ~= 0) then
+            a:set_hvel(1024/30)
+            a:set_vvel(-1024/30)
+        else
+            a:set_hvel(50*delay)
+        end
+        a.movflags = actor.MOVFLAGS.geth + actor.MOVFLAGS.getv
     end,
 }