Goof1 Goof2 Goof3 Goof9
Goof5 Goof6 Goof7

Goof8
Goof4

Goof10
Okay, this last one is kinda subtle, but, note the electric cord coming out of the clock.
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The 10 School Days Errors

Scholastic's DynaMath magazine

Image ©Mike and Diana Okamoto