Scene 0 contains a number of generic responses intended for when inventory items are used incorrectly across the entire game (viewable with "scene_resources 0" in the debug console).
These trigger in the original DOS and Windows re-release versions of The Labyrinth of Time but not the ScummVM implementation.
(Interestingly, the "scene_resources 0" debug command seems to make these actions usable again. The ShowDiff sound does not play in this case. See bug 6995.)
Two save files or attached. lab.001 is a ScummVM save; 0 is a save file for the Windows re-release for comparison (goes in "C:\Users[name]\AppData\Roaming\Wyrmkeep\The Labyrinth of Time Save Games").
Both save files are in Scene 74 with the falcon statue in the inventory. Using the falcon statue against the cabinets should produce the message "The Falcon Statue makes a lousy club."
Reproduced in ScummVM 1.8.0git6238-ge5e2a8d (Jan 24 2016 05:54:01), Win32
It would be nice to fix it before the release of 1.8.0. Raising priority.
Thanks for catching this. It should be fixed now. (We were failing to detect if scene 0 wasn't loaded yet.)