diff --git a/src/f_finale.cpp b/src/f_finale.cpp
index 2b220fddb..2b9fc8773 100644
--- a/src/f_finale.cpp
+++ b/src/f_finale.cpp
@@ -762,7 +762,7 @@ void F_CastDrawer (void)
 	FTexture*			pic;
 	
 	// erase the entire screen to a background
-	screen->DrawTexture (TexMan[GStrings("BOSSBACK")], 0, 0,
+	screen->DrawTexture (TexMan[GStrings("bgcastcall")], 0, 0,
 		DTA_DestWidth, screen->GetWidth(),
 		DTA_DestHeight, screen->GetHeight(),
 		TAG_DONE);
diff --git a/wadsrc/static/mapinfo/plutonia.txt b/wadsrc/static/mapinfo/plutonia.txt
index 612aaf264..34101541b 100644
--- a/wadsrc/static/mapinfo/plutonia.txt
+++ b/wadsrc/static/mapinfo/plutonia.txt
@@ -373,7 +373,7 @@ map MAP32 lookup "PHUSTR_32"
 
 cluster 5
 {
-	flat = "SLIME16"
+	flat = "$BGFLAT06"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "P1TEXT"
 }
@@ -382,7 +382,7 @@ cluster 5
 
 cluster 6
 {
-	flat = "RROCK14"
+	flat = "$BGFLAT11"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "P2TEXT"
 }
@@ -391,7 +391,7 @@ cluster 6
 
 cluster 7
 {
-	flat = "RROCK07"
+	flat = "$BGFLAT20"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "P3TEXT"
 }
@@ -400,7 +400,7 @@ cluster 7
 
 cluster 8
 {
-	flat = "RROCK17"
+	flat = "$BGFLAT30"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "P4TEXT"
 }
@@ -409,7 +409,7 @@ cluster 8
 
 cluster 9
 {
-	flat = "RROCK13"
+	flat = "$BGFLAT15"
 	music = "$MUSIC_READ_M"
 	entertext = lookup, "P5TEXT"
 }
@@ -418,7 +418,7 @@ cluster 9
 
 cluster 10
 {
-	flat = "RROCK19"
+	flat = "$BGFLAT31"
 	music = "$MUSIC_READ_M"
 	entertext = lookup, "P6TEXT"
 }
diff --git a/wadsrc/static/mapinfo/tnt.txt b/wadsrc/static/mapinfo/tnt.txt
index 438b61ff1..9d069c8d5 100644
--- a/wadsrc/static/mapinfo/tnt.txt
+++ b/wadsrc/static/mapinfo/tnt.txt
@@ -373,7 +373,7 @@ map MAP32 lookup "THUSTR_32"
 
 cluster 5
 {
-	flat = "SLIME16"
+	flat = "$BGFLAT06"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "T1TEXT"
 }
@@ -382,7 +382,7 @@ cluster 5
 
 cluster 6
 {
-	flat = "RROCK14"
+	flat = "$BGFLAT11"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "T2TEXT"
 }
@@ -391,7 +391,7 @@ cluster 6
 
 cluster 7
 {
-	flat = "RROCK07"
+	flat = "$BGFLAT20"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "T3TEXT"
 }
@@ -400,7 +400,7 @@ cluster 7
 
 cluster 8
 {
-	flat = "RROCK17"
+	flat = "$BGFLAT30"
 	music = "$MUSIC_READ_M"
 	exittext = lookup, "T4TEXT"
 }
@@ -409,7 +409,7 @@ cluster 8
 
 cluster 9
 {
-	flat = "RROCK13"
+	flat = "$BGFLAT15"
 	music = "$MUSIC_READ_M"
 	entertext = lookup, "T5TEXT"
 }
@@ -418,7 +418,7 @@ cluster 9
 
 cluster 10
 {
-	flat = "RROCK19"
+	flat = "$BGFLAT31"
 	music = "$MUSIC_READ_M"
 	entertext = lookup, "T6TEXT"
 }