Using the Free Look tool included with the Gamecube emulator Dolphin, a rather grim Easter Egg can be found on the packaging box of the character Mr. Snuggles.

The message is flipped upside down and reads:

I'll hug you and kill you.

You'll never sleep again.

I'll kill your parents.

In the game’s concept art gallery, there is artwork of an early scanner pod showing Arnold being scanned with an Irken Invader guarding the pod

In the Wii version, there are unused master model files of characters from the KaBlam! and Action League series of television shows.