The Beeper Queen / Oskar Can't Read? - S4-E4
Oskar: Kitty, kitty, kitty. Do you want to pet the kitty? Yes, I want to pet the kitty. Pet, pet, pet. Look everybody, I'm petting the kitty.
The Beeper Queen / Oskar Can't Read? - S4-E4
Oskar: Kitty, kitty, kitty. Do you want to pet the kitty? Yes, I want to pet the kitty. Pet, pet, pet. Look everybody, I'm petting the kitty.

Girl Trouble / School Dance - S3-E18
Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is... Helga. This happens because the shot is taken from the episode "Helga's Love Potion."
Downtown as Fruits / Eugene's Bike - S1-E1
Trivia: Eugene's bike has a "YOOJ" (pronounced like "Eugene" without the "een") license plate.
Question: Does anybody know what year this show takes place? I've noticed that there are all these present day video games, keyboards, etc. on the show, but all the cars are old fashioned.
Answer: The show is based in present day times. Plus most cars aren't old fashtioned, I recall seeing a limo and not to mention a cherry picker, etc.