Just before the robot fight, Sheldon holds the remote with both hands. In the next shot, his left arm hangs at his side.
When trash talking, and Kripke suggests a private battle, his reasoning is that "there's no guarantee we'll face each other in the round robin." "Round Robin" is a tournament structure which results in all competitors facing each other throughout the rounds, so they should in theory be guaranteed to face each other.
But there might be the chance that one of their robots is destroyed in a fight before facing the other one.
When the killer robot attacks the toaster oven, electrical sparks fly from the oven, yet it's clearly unplugged.
Sparks would be caused by a rapidly spinning metal blade slicing through a metal case.
Sparks would be caused by a rapidly spinning metal blade slicing through a metal case.
When Leonard gets off the phone with Howard's mother you can see as he goes to hang up that it has a contacts list up instead of being in a call.
When both robots are in the room, the flame thrower on Kripke's robot is clearly offset. When they are going down the hallway, the flame thrower is center line.
During robot-related trash talk in the university cafeteria, Kripke, who supposedly can't pronounce the letters 'r' and 'l' and who has already used the word "wobot" twice along with utterances such as "pwasma wab" and "dewusions," clearly and correctly pronounces the 'r' in "Robot" and the 'l' in "California" and "League" when mentioning the Southern California Robot Fighting League Round Robin Invitational. Among other mistakes in this trash talk session, he also correctly pronounces the letter 'l' in the name of his robot (which he renders as "The Kwipke Kwippler").