1.23:

Simply copying the same animated tile to go up to JCS' strict limit of 128 animated tiles let me make some ugly lines on the 16-bit textured background (and only the 16-bit, textured background):

These lines appear only over certain colors. Each animated tile added over the limit seems to add one more color that the lines will appear over, and it's clearly in an order according to the palette. This seems to mean that at the aforementioned JCS cap, these lines appear over half the colors.

The only other effect I found offhand was that killing Jazz instantly skipped the death animation sequence. I have a gut feeling that trigger/destruct events will have something to do with all this, I'll continue experimenting.