Continuity mistake: After Eric smears his hands all over Topanga's face, the amount of skin cream on her right cheek drastically decreases when she is telling Cory she's going to go wash her face. (00:14:35 - 00:15:00)
Continuity mistake: In every other episode where Shawn's trailer is shown, next to the kitchen there was always sort of a hallway leading to bedrooms/bathrooms. When Shawn and Jack are in the trailer in this episode, there is one big wall.
Character mistake: When Sarah the waitress is filling up Cory and Shawn's coffee cups, she puts hardly any coffee in them, with Cory's barely being a couple of drips. A waitress that works on tips wouldn't be so lackadaisical about filling a customer's coffee cup. Cory and Shawn just sat down as well, so it's not like she was just topping them off. (00:02:58)
Audio problem: When the waitresses are performing their song, you can tell they are lip syncing to a recording even though they are supposed to be giving a live performance. The vocals have a noticeable amount of reverb and are mixed evenly with the instrumental track despite the fact they aren't even using microphones. (00:06:49 - 00:09:00)
Continuity mistake: When Morgan emerges from the kitchen after Topanga picked her up from school, a wall is visible behind the door leading to the kitchen, even though the kitchen itself should be visible. (00:02:18)
Visible crew/equipment: After Amy's C-section Alan walks into the waiting area, and just as his kids gather around him in the wide shot the boom mic dips into view at the top, center of the screen between Alan and the plant (viewed on iPad screen). (00:20:10)
Continuity mistake: Just after Cory talks about being a "baby shower machine", Morgan walks past him. There's then a quick shot of Alan and then we see Cory again, and again Morgan walks past him. It's not the same shot from two different angles, as Cory is acting differently each time.
Other mistake: Early in the episode, Amy mentions that she is 7 1/2 months pregnant. This episode takes place around Valentine's Day, which means she would have become pregnant at either the end of June or the beginning of July. However, she revealed she was pregnant around the time Cory, Shawn and Topanga had their senior prom, which would have been around the end of May or beginning of June at the latest, prior to their high school Graduation. So she should be around 8 1/2 months pregnant at the least.
Continuity mistake: After Topanga draws a lipstick heart around her face and Shawn says "Use a mirror, babe," a closeup is shown of Topanga smiling at Shawn and you can see Cory has lipstick on his forehead before Topanga has drawn it on him. (00:20:30)
Can I Help to Cheer You? - S6-E18
Continuity mistake: When Tommy is saying to Eric "We've been hanging out with each other for a long time now," Eric's coffee mug is mere inches from his face. When the shot changes, the mug is almost set down on the table. (00:00:58)
Continuity mistake: Correct me if I'm wrong, but didn't Topanga once call her mother 'Chloe'?