Some news.
SWMHacker found a way to edit credits screen in Titenic, with this code we were able to load cutscene and part of the title screen (PPU1 only)
I put the cutscene as they appear in the game code:
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same screen as Game Over, except the real game over screen is on a different value which means it's a cutscene.
Title screen (PPU1 loaded only, it's a bit complicated to find PPU2 and eventually PPU3)
What wasn't seen in all screens of the game:
Player Select
Level select (may not exist at all)
7th cutscene (in HL there's 7 values for the cutscenes, 2 are glitched, only 6 were found in Titenic).