Adam and Dave only, and Dave didn't have his guitar, so he just sang and mugged for the audience. They were in the corner of Newbury Comics that had all the weird action figures so he was constantly taking stuff off the shelves to joke about. For the "rockin' a kiss" line in "Holiday", he tried to grab a Gene Simmons action figure and knocked over a 3-foot LeeVees poster on an easel by accident - hence the laughter from everyone near the end.