In "The Picture Frame" episode, when the guys are in the police office, they go through a series of things like spilling the beans and having the book thrown at them.
Watch carefully when they throw the book, Mike's sunglasses dissapear for one shot.
that isn't a slipup, The Monkees were full of zany atuff like that, there's all sorts of slip-ups like that but they're not slip-ups, it was probably done on purpose.
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