Revealing mistake: When Max is strapped to the armchair it becomes obvious on at least three occasions throughout the scene that the strap is not secure and he can escape the chair by pressing down into the fabric, but chooses not to.
Audio problem: Every time Barb is seen playing the guitar, the finger movements and the music we hear don't match.
Cheer and Present Danger - S2-E8
Audio problem: After Cherry states "phone number," as in deleting Phoebe's phone number while in a fight, Phoebe repeats it, in a more disappointed tone. But as she taps her finger on the delete button, the beep does not match up with when her finger taps the button.
Continuity mistake: When Max leaves with his ten-foot pole he knocks a lamp off a table and breaks it. When he returns the lamp disappears from the floor.
Plot hole: When Max is shooting the epic fail video of Billy and Nora, the camera turns off without Max touching any buttons.
Continuity mistake: Phoebe gets a lump on her head but at the tennis tournament it disappears. (01:00:00)
Continuity mistake: When Phoebe and Max are tied together, the whip starts to cause sparks to fly in the the air. Then, a lightning bolt appears and Electress (really Barb) pops up and says "shocked to see me?" and the whip isn't sparking anymore.
Suggested correction: Her presence stops the whip from sparking as it was her weapon.
But wouldn't the fact that Max and Phoebe are touching the whip also keep it from sparking? True, it's not their weapon, but they are "supes," so their powers should have prevented it.
Other mistake: Even though Max nor Phoebe control the whip, just the fact they are "supes" should have allowed them to control it.
Revealing mistake: When the whip is sparking, no black marks are left on the floor.
It's Not What You Link - S2-E19
Continuity mistake: When Phoebe is left alone at the couch, her mom comes up to talk to her. Before her mom shows up, there is a water bottle in front of Phoebe. After Phoebe's mom sits down next to her, the water bottle moves to the other side of the table without anyone touching it.
It's Not What You Link - S2-E19
Continuity mistake: When Phoebe takes a bite out of the Jelly Jam, goo goes all over her. In the next shot, her shirt is spotless.
Visible crew/equipment: When Hank is bribing Billy and Nora with the giant chocolate chip cookie the camera is reflected in the window on the door.
Revealing mistake: The stunt double for Bradford is rather obvious when he's in his wrestling uniform.
Continuity mistake: When Phoebe summons her suspects who she thinks might be the Rebel Raptor and when only Gideon showed up, he is holding red and white flowers in a bouquet, but in the next shot, he is holding yellow and purple flowers.
Continuity mistake: When Max and his band are at Splat Burger in the beginning, the table that the band is sitting at changes. When Max introduces the band to Wolfgang, they are sitting at a booth near the door. When Max gets up to play his song, they are sitting at a booth in the middle of the restaurant. When Max is covered in tomatoes, the band is at the booth by the door again.
The Girl with the Dragon Snafu - S2-E23
Continuity mistake: When Hank gets frustrated, he pulls the doorknob off the new bathroom. When he is standing on the rug, we can see that the doorknob is back on the door.
Welcome to the Family Part 1 - S2-E24
Revealing mistake: When the father is launched down the stairs he's very obviously been replaced by a dummy. Watch how his left arm bends awkwardly.
Welcome to the Family Part 2 - S2-E25
Revealing mistake: When the family releases Chloe's bubble ability for the last time in the episode the bubble machine is visible.
Suggested correction: There is no bubble machine visible.
Welcome to the Family Part 2 - S2-E25
Other mistake: Throughout this episode, Max is captured by villains and is about to be bitten by a vat of hermit crabs. It's pretty obvious that between every scene of Max, instead of the platform lowering, it's just getting higher. Clearly, Max should've got to the hermit crabs about halfway through the episode.
Phoebe vs Max: The Sequel - S3-E1
Continuity mistake: Throughout the episode Max's watch is on his on his left hand, except in one shot at the high school.