diff --git a/src/g_shared/a_weapons.cpp b/src/g_shared/a_weapons.cpp
index 27f7b088e..93036b031 100644
--- a/src/g_shared/a_weapons.cpp
+++ b/src/g_shared/a_weapons.cpp
@@ -1297,7 +1297,7 @@ void FWeaponSlots::SetFromGameInfo()
 	// Append extra weapons to the slots.
 	for (i = 0; i < NUM_WEAPON_SLOTS; ++i)
 	{
-		for (unsigned j = 0; j < gameinfo.DefaultWeaponSlots[i].Size(); i++)
+		for (unsigned j = 0; j < gameinfo.DefaultWeaponSlots[i].Size(); j++)
 		{
 			PClassWeapon *cls = dyn_cast<PClassWeapon>(PClass::FindClass(gameinfo.DefaultWeaponSlots[i][j]));
 			if (cls == NULL)
diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 479ce97e5..030e85406 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -1119,6 +1119,10 @@ FUNC(LS_ThrustThing)
 	}
 	else if (it)
 	{
+		if (level.flags2 & LEVEL2_HEXENHACK && backSide)
+		{
+			return false;
+		}
 		ThrustThingHelper (it, BYTEANGLE(arg0), arg1, arg2);
 		return true;
 	}
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 09a209496..7894e7382 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -3991,7 +3991,8 @@ struct aim_t
 					if (sv_smartaim < 2)
 					{
 						// friends don't aim at friends (except players), at least not first
-						Printf("Hit friend %s at %f,%f,%f\n", th->GetClass()->TypeName.GetChars(), th->X() / 65536., th->Y() / 65536., th->Z() / 65536.);
+						if (aimdebug)
+							Printf("Hit friend %s at %f,%f,%f\n", th->GetClass()->TypeName.GetChars(), th->X() / 65536., th->Y() / 65536., th->Z() / 65536.);
 						SetResult(thing_friend, in->frac, th, thingpitch);
 					}
 				}
diff --git a/src/p_maputl.cpp b/src/p_maputl.cpp
index c6453285e..ffaa2b4e4 100644
--- a/src/p_maputl.cpp
+++ b/src/p_maputl.cpp
@@ -265,7 +265,7 @@ void P_LineOpening (FLineOpening &open, AActor *actor, const line_t *linedef,
 	}
 
 	// avoid overflows in the opening.
-	open.range = (fixed_t)MIN<QWORD>((QWORD)open.top - open.bottom, FIXED_MAX);
+	open.range = (fixed_t)MIN<SQWORD>((SQWORD)open.top - open.bottom, FIXED_MAX);
 }
 
 
@@ -874,7 +874,7 @@ void FMultiBlockLinesIterator::startIteratorForGroup(int group)
 
 void FMultiBlockLinesIterator::Reset()
 {
-	continueup = continueup = true;
+	continueup = continuedown = true;
 	index = -1;
 	portalflags = 0;
 	startIteratorForGroup(basegroup);
diff --git a/src/p_udmf.cpp b/src/p_udmf.cpp
index 54a2a1a8d..2c388e178 100644
--- a/src/p_udmf.cpp
+++ b/src/p_udmf.cpp
@@ -103,7 +103,7 @@ static char HexenSectorSpecialOk[256]={
 static inline bool P_IsThingSpecial(int specnum)
 {
 	return (specnum >= Thing_Projectile && specnum <= Thing_SpawnNoFog) ||
-			specnum == Thing_SpawnFacing || Thing_ProjectileIntercept || Thing_ProjectileAimed;
+			specnum == Thing_SpawnFacing || specnum == Thing_ProjectileIntercept || specnum == Thing_ProjectileAimed;
 }
 
 enum
diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index 98dd60f2d..db1f722f1 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -146,6 +146,7 @@ bool ACustomInventory::CallStateChain (AActor *actor, FState *state)
 				if (proto->ReturnTypes[0] == TypeState)
 				{ // Function returns a state
 					wantret = &ret[0];
+					retval = false;	// this is a jump function which never affects the success state.
 				}
 				else if (proto->ReturnTypes[0] == TypeSInt32 || proto->ReturnTypes[0] == TypeBool)
 				{ // Function returns an int or bool
diff --git a/src/thingdef/thingdef_expression.cpp b/src/thingdef/thingdef_expression.cpp
index 8239f0e47..7ecc3c3c4 100644
--- a/src/thingdef/thingdef_expression.cpp
+++ b/src/thingdef/thingdef_expression.cpp
@@ -3220,7 +3220,7 @@ FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
 
 int DecoCallLineSpecial(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
 {
-	assert(numparam > 2 && numparam < 7);
+	assert(numparam > 2 && numparam < 8);
 	assert(numret == 1);
 	assert(param[0].Type == REGT_INT);
 	assert(param[1].Type == REGT_POINTER);