Million Dollar Maybe - S21-E11
Corrected entry: Homer breaks his arm when pulling his arm out of the tree where he hides his money when Bart asks what is he doing, but for the rest of the episode his arm is fine. (00:16:00)
Million Dollar Maybe - S21-E11
Corrected entry: Homer breaks his arm when pulling his arm out of the tree where he hides his money when Bart asks what is he doing, but for the rest of the episode his arm is fine. (00:16:00)

The Simpsons Christmas Special: Simpsons Roasting on an Open Fire - S1-E1
Continuity mistake: Lewis changes from black to yellow when Milhouse dares Bart to pull Santa's beard off. (00:14:10)
Skinner's Sense of Snow - S12-E8
Nelson: Hey, look how much Skinner makes: $25,000 a year.
Bart: Let's see, he's 40 years old times 25 grand. Whoa, he's a millionaire.
Skinner: I wasn't a principal when I was one.
Nelson: Plus, in the summer, he paints houses.
Milhouse: He's a billionaire.
Skinner: If I were a billionaire, why would I be living with my mother? [All the kids laugh at him.] They're just not responding to logic anymore.

Trivia: Maggie scans as $847.63 in the supermarket at the beginning (not NRA4EVER, as Troy Maclure asserts in 3F31 "The Simpsons 138th Episode Spectacular), the price it costs to feed and care for the average American baby every month.
Question: Which episodes feature the "Howling Dog" (usually used on outside shots of buildings)?
Correction: Clearly Homer didn't break his arm. He just dislocated it.
MasterOfAll