Continuity mistake: Every time the outside of the pharmacy is shown it's different than when seen from the inside.
Continuity mistake: When Nadine is holding Patrick the toy he he holding keeps changing between a dinosaur and a troll.
Continuity mistake: When Grace sits on Quentin's bed he is holding a comic book, when the shot changes he is no longer holding it.
Continuity mistake: When Grace and Nadine are at the bar, Nadine starts to take money out of her purse. The shot changes and suddenly there is money on the table. Then the amount of money on the table keeps changing between shots.
Continuity mistake: When Grace is sitting on the couch talking to the kids grandparents she is holding Patrick and a block. Then at one point the block disappears, the shot changes she is now holding a different toy.
Visible crew/equipment: At the beginning of the episode when Libby and Wade are talking, a boom mic can be seen in a mirror that is on the refrigerator.
Continuity mistake: When Grace gives Nadine a drink she takes the cover off and puts in on the table right in front of her. At one point during the scene it moves to the middle of the table.
Continuity mistake: When Grace is talking to Quentin's teacher she erases some letters from the chalkboard. For the rest of the scene the amount that is erased keeps changing.
Factual error: At about 8 minutes in, Grace's ex-husband is talking about flash flooding and water mixing with electricity. He's makes a comment about going up like Gary Gilmore. Gilmore was executed by firing squad and not in the electric chair.
Continuity mistake: When Grace goes into the kitchen at the end of the episode she shuts the door. The next time the door is seen it is open.
Continuity mistake: When Grace and Nadine walk into the house there is a box of laundry detergent in the background facing forwards. When Wade comes in it's turned around.
Jimmy's Girl - S2-E5
Continuity mistake: While Grace and Jimmy are at the pub discussing things, Grace takes away Jimmy's empty beer glass and puts it on the opposite side of the snack bowl. A few minutes later Jimmy reaches for the glass and it's 1/4 full, with ice. (00:20:40)
Jimmy's Girl - S2-E5
Continuity mistake: In the final scene when Grace goes to checkout at the grocery store, she is holding her credit card. The shot changes and now the cashier has her card.
Continuity mistake: When everyone is commenting on Vic's hair at work, he has his hands on his hips. The shot changes and they are no longer on his hips.
Hello, I'm Your Mother - S2-E16
Continuity mistake: In the opening scene Grace's coffee mug keeps changing position.
Continuity mistake: Nadine puts a plate on the table with an apple and a sandwich. The apple is on the right and sandwich is on the left. The next time we see the plate they have switched sides. Nadine then takes a bite out the apple and puts it on the table. The next time the apple is seen it has moved.
Grace and Rick and the Dance of Doom - S3-E3
Continuity mistake: The milk carton Quentin puts on the counter keeps changing position.
Continuity mistake: When Matthew's adoptive mother gets up to leave, her purse strap is on her shoulder. When she walks to the front door, turns to Grace and says "listen lady" she's not wearing the purse. When she turns to open the front door and walks out, she's wearing the purse again on her shoulder. (00:11:40)
Continuity mistake: Quentin comes into the basement, the door is open. The next time we see the door it is closed.
Continuity mistake: Libby goes outside and says "You mean I had a very great friend." She walks back in the house and shuts the door but it opens back up. The next shot the door is closed.
