Watch the episode "The Same Game" Near the end, when Wendell has the boomerang. When Tim's mom talks to him, he is now holding the ball. Not very big...
That isn't a slip-up. The mom clearly took the boomerang out of his hands. But the ball appearing there I have no explanation for...
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Duffman1994 writes:
At first, they take the ball, then when they go from blobs to normal, Dr. Bender takes the boomerang then later, they play with the ball then take it back. it's NOT a slip-up!!!