The orange sweater seen being worn by Mark Hoppus was auctioned, as part of a grouping of Blink-182 memorabilia auctioned to benefit victims of the 2011 Tohoku earthquake, tsunami, and Fukushima Daiichi Nuclear Plant meltdown.
The theater employee/snack bar attendant character is portrayed by Rick DeVoe, who at the time was the band manager for Blink-182.
There are two additional actors in the video, who portray "Mark's ex-girlfriend" (printed on screen) and her new boyfriend, the names of these two actors, and the character's names (other than 'ex-girlfriend') are not established.