diff --git a/polymer/eduke32/source/lunatic/bcheck.lua b/polymer/eduke32/source/lunatic/bcheck.lua
index ac9d841e4..29ea4c9c8 100644
--- a/polymer/eduke32/source/lunatic/bcheck.lua
+++ b/polymer/eduke32/source/lunatic/bcheck.lua
@@ -89,5 +89,11 @@ function bcheck.quote_idx(qnum, onlyidx)
     return cstr
 end
 
+function bcheck.top_level(funcname)
+    if (ffiC.g_elCallDepth > 0) then
+        error("Invalid use of "..funcname..": must be called from top level", 3)
+    end
+end
+
 
 return bcheck
diff --git a/polymer/eduke32/source/lunatic/control.lua b/polymer/eduke32/source/lunatic/control.lua
index 3675f391f..e0f10ed59 100644
--- a/polymer/eduke32/source/lunatic/control.lua
+++ b/polymer/eduke32/source/lunatic/control.lua
@@ -12,6 +12,7 @@ local bit = require("bit")
 local io = require("io")
 local math = require("math")
 local geom = require("geom")
+local bcheck = require("bcheck")
 local con_lang = require("con_lang")
 
 local byte = require("string").byte
@@ -93,17 +94,19 @@ end
 ---=== ACTION / MOVE / AI ===---
 
 function action(name, ...)
+    bcheck.top_level("action")
     action_or_move("action", 5, def.action, name, ...)
 end
 
 function move(name, ...)
+    bcheck.top_level("move")
     action_or_move("move", 2, def.move, name, ...)
 end
 
-
+-- Get action or move for an 'ai' definition.
 local function get_action_or_move(what, val, argi)
     if (val == nil) then
-        return {}  -- will init the struct to all zeros
+        return {}  -- ffi.new will init the struct to all zeros
     elseif (type(val)=="string") then
         local am = def[what][val]
         if (am==nil) then
@@ -112,13 +115,20 @@ local function get_action_or_move(what, val, argi)
         return am
     elseif (ffi.istype("con_"..what.."_t", val)) then
         return val
+    elseif (type(val)=="number") then
+        if (val==0 or val==1) then
+            -- Create an action or move with an ID of 0 or 1 but all other
+            -- fields cleared.
+            return ffi.new("con_"..what.."_t", val)
+        end
     end
 
-    -- TODO: literal number actions/moves?
-    error("bad argument #"..argi.." to ai: must be string or "..what, 3)
+    error("bad argument #"..argi.." to ai: must be string or (literal) "..what, 3)
 end
 
 function ai(name, action, move, flags)
+    bcheck.top_level("ai")
+
     if (lastid.ai <= -(2^31)) then
         error("Too many AIs defined", 2);
     end
@@ -143,7 +153,6 @@ end
 
 ---=== RUNTIME CON FUNCTIONS ===---
 
-local bcheck = require("bcheck")
 local check_sector_idx = bcheck.sector_idx
 local check_tile_idx = bcheck.tile_idx
 local check_sprite_idx = bcheck.sprite_idx
@@ -1584,7 +1593,7 @@ function _setaspect(viewingrange, yxaspect)
 end
 
 function _setgamepalette(pli, basepal)
-    ffiC.P_SetGamePalette(player[pli], basepal)
+    ffiC.P_SetGamePalette(player[pli], basepal, 2+16)
 end
 
 -- Gamevar persistence in the configuration file
diff --git a/polymer/eduke32/source/lunatic/defs.ilua b/polymer/eduke32/source/lunatic/defs.ilua
index 0890f025f..abf4b1cb0 100644
--- a/polymer/eduke32/source/lunatic/defs.ilua
+++ b/polymer/eduke32/source/lunatic/defs.ilua
@@ -1360,9 +1360,7 @@ G_._G = G_
 local gameactor_internal = gameactor_internal  -- included in lunatic.c
 -- gameactor(tilenum [, strength [, act [, mov [, movflags]]]], actor_func)
 local function our_gameactor(tilenum, ...)
-    if (ffiC.g_elCallDepth > 0) then
-        error("Invalid use of gameactor: must be called from top level", 2)
-    end
+    bcheck.top_level("gameactor")
 
     local args = {...}
     if (type(tilenum) ~= "number") then
diff --git a/polymer/eduke32/source/lunatic/lunacon.lua b/polymer/eduke32/source/lunatic/lunacon.lua
index 91df19fc6..929280390 100644
--- a/polymer/eduke32/source/lunatic/lunacon.lua
+++ b/polymer/eduke32/source/lunatic/lunacon.lua
@@ -308,7 +308,8 @@ function on.actor_end(usertype, tsamm, codetab)
     local str = ""
     for i=2,math.min(#tsamm,4) do
         if ((i==3 or i==4) and tsamm[i]=="0") then
-            -- HACK, gameactor() currently doesn't support literals
+            -- HACK, gameactor() currently doesn't support literals for actions
+            -- and moves.
             tsamm[i] = "'NO'"
         end
         str = str .. tostring(tsamm[i])..","
@@ -603,11 +604,12 @@ local function do_define_composite(labeltype, identifier, ...)
         return
     end
 
-    -- Fill up omitted arguments with zeros.
+    -- Fill up omitted arguments denoting composites with zeros.
     local isai = (labeltype == LABEL.AI)
     local args = {...}
     for i=#args+1,labeltype do
-        -- passing nil to con.ai will make the action/move the null one
+        -- Passing nil/nothing as remaining args to con.ai will make the
+        -- action/move the null one.
         args[i] = (isai and i<=2) and "nil" or 0
     end