diff --git a/libultraship/libultraship/Lib/Fast3D/U64/PR/ultra64/gbi.h b/libultraship/libultraship/Lib/Fast3D/U64/PR/ultra64/gbi.h
index b91856ef6..8af624e8f 100644
--- a/libultraship/libultraship/Lib/Fast3D/U64/PR/ultra64/gbi.h
+++ b/libultraship/libultraship/Lib/Fast3D/U64/PR/ultra64/gbi.h
@@ -3175,7 +3175,7 @@ _DW({                                   \
              (_SHIFTL(r, 24, 8) | _SHIFTL(g, 16, 8) |   \
               _SHIFTL(b, 8, 8) | _SHIFTL(a, 0, 8)))
 
-#define gsDPSetGrayscaleColor(pkt, r, g, b, lerp)       \
+#define gsDPSetGrayscaleColor(pkt, r, g, b, lerp)        \
             DPRGBColor(pkt, G_SETINTENSITY, r, g, b, lerp)
 #define gDPSetEnvColor(pkt, r, g, b, a)                 \
             DPRGBColor(pkt, G_SETENVCOLOR, r,g,b,a)
diff --git a/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp b/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
index 130d07b73..1d03befe6 100644
--- a/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
+++ b/libultraship/libultraship/Lib/Fast3D/gfx_pc.cpp
@@ -1397,7 +1397,7 @@ static void gfx_sp_tri1(uint8_t vtx1_idx, uint8_t vtx2_idx, uint8_t vtx3_idx, bo
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.r / 255.0f;
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.g / 255.0f;
             buf_vbo[buf_vbo_len++] = rdp.grayscale_color.b / 255.0f;
-            buf_vbo[buf_vbo_len++] = rdp.grayscale_color.a / 255.0f; // Unused
+            buf_vbo[buf_vbo_len++] = rdp.grayscale_color.a / 255.0f; // lerp interpolation factor (not alpha)
         }
 
         for (int j = 0; j < num_inputs; j++) {
diff --git a/soh/src/code/z_play.c b/soh/src/code/z_play.c
index f62e719ba..6218b7d76 100644
--- a/soh/src/code/z_play.c
+++ b/soh/src/code/z_play.c
@@ -1,5 +1,3 @@
-#include <stdio.h>
-
 #include "global.h"
 #include "vt.h"