Stuck in the Eighties

You are in the middle of moving into your dream house. While unpacking boxes, you find your high school time capsule from 1989 tucked away in a box. You decide you can't continue unpacking until you take a trip down memory lane. You find your old mix tapes, notes, and maybe a few photographs. 
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You open the lid, and immediately you are transported to December 31, 1989. Upon arriving back in time, a mysterious man with a mullet hands you a locked box and tells you that the key for the time capsule is inside if you can crack the code before the 1990s begin! 
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Will you manage to make it back to the present day, or will you be forced to relive the 90s again.

While you're trying to figure out what is a clue and what is a decoy...do the Safety Dance!