When no input is made on the title screen of Super Mario 64 for an extended time, a series of short gameplay demos will play. The game contains an extremely short unused demo input sequence that is not assigned to any level, but if assigned to the Cool, Cool Mountain demo header, reveals why it was cut short.
Watching the demo shows Mario run up against a sign and then stop before the demo abruptly ends. This suggests that the programmer tasked to record the demo either wanted to read the sign (a famously finicky action in this game, as Mario can only read signs when he is in very particular states and facing angles), or jump over it, and failed to do the desired action. Mario's stopping seems to be a result of the programmer stopping all input in order to discard the demo and attempt to record it again.
Why this failed attempt was left in the game's data is unknown.
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