When Jerry first pays for his laundry, Vic is standing behind the desk. Jerry then goes over to talk to George, and Vic is suddenly at the far end of the room.
When Jerry and Kramer are at the laundromat to get revenge, Jerry is distracting the owner while Kramer puts the cement in the washer. At one point you see Kramer emptying the cement into the washer & the bag is almost empty. In the next shot Kramer is holding a full bag signaling to Jerry that the "job" is done.
Kramer says that Newman is going to kill himself because he "has no job and no woman". By the next season, Newman's character is revealed to be a postman and has been for years. This occurred because the character (voice provided by Larry David) of Newman was only supposed to be in this episode but was developed as a physical character in the next season.