That is not to say that any piece of trivia with that tag is untrustworthy! This simply makes it more transparent to see if it's unknown where the information within the trivia originates from, as a lot of it comes from the defunct Pizza Tower Discord and not archived Twitch streams.

It was first teased in Thing of the week 1 youtu.be/pHEUBoawlm0, however it would not be added into the game proper until four months later.
It was likely one of the experiments with the regular power ups, similarly to the Pepper Pizza one.

This was likely done to avoid potential legal problems with selling merchandise of a character, not owned by Tour de Pizza.

These animations were done before Pizzaface's idle animation was redrawn, which is likely why the shade of yellow is different.
Interestingly enough, despite both animations being introduced in Eggplant build, the Flush cards uses the correct shade of yellow.

This game mode only appears in Peppino's Xmas Break, later brought back in Boss v0, before getting scrapped entirely.

Besides a glitch right at the start of the level, where not all objects that give points are removed, there is no way to increase score, only lose it.
Once the player has finished a stage, a second sign, colored red, appears next to the entrance to the level, showing the rank they received.

The Raid can sprite, used in the footage, was removed from the final release, however the whole fight is still functional.

That was short: should be fine now. Thanks again!