The frog's in-game models appear to be completely different in both single-player and multiplayer modes.
In the PC version, the Hasbro logo plays as normal, albeit the ending shows the "Escape" video compression logo. However, in the PS1 version, the logo is somewhat out of sync, resulting in both the audio getting cut off at the end, and the "Escape" logo not being shown.
Two pieces of game footage that play during the end credits contain material that don't actually appear in the main game. First, the baby frogs don't burst when Frogger approaches them. Second, the barrels from the Sewer Zone don't explode when hopped on. It's possible that the footage was recorded before these features were removed later in development.