After you defeat Mordack and Graham starts walking toward the bottle, the embers in Mordack's lab (bottom-right of screen) turn to black with random coloured pixels. See attached screenshots.
Game version: DOS, Floppy, English, v. 0.000.062
ScummVM version: 1.2.0svn51829
Computer: MacBook 5,2, Mac OS X 10.6
Normal embers before Graham starts walking
Glitch after Graham starts walking
Save during battle
This is actually the same as bug 3041134: all of the game resources related to the end sequence after defeating Mordack are corrupted/missing. The missing fire is caused by corrupted view 933. Closing as duplicate
This artifact has been marked as a duplicate of artifact 3041134 with reason:
Corrupt/missing resources