Lois tells Peter to be careful with the whip, because "we're renting this place". A few seasons ago she stated aloud that the broken condom that created Chris won them a law suit that paid for the house(they own the house).
Peter, Joe, and Quagmire encounter three men that take the booth they always sit in at the Drunken Clam. When Peter confronts them, he pulls out a whip, taser, and one of Quagmire's Hawaiian shirts. One of the guys knocks the whip and taser out of Peter's hands when he gets distracted by Quagmire and then Peter drops the shirt on the floor. In the shot of Peter and his pals leaving the bar, the shirt is on the floor, but the whip and the taser are nowhere to be seen.
Towards the end, when Peter lists historical events that happened while he was sitting in the booth at The Drunken Clam, the scene flashes back to his reaction to the explosion of The Challenger, where Joe and Quagmire are sitting next to him. The Challenger exploded in 1986 but Peter and Quagmire didn't meet Joe until 1999.