Revealing mistake: When Charles shows the picture of the horse and says "look what you get when you search for 'Charles Boyle medal of valor'" he's typed "peanut butter the horse" into his phone.
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.
Kreplach and a Tiny Tush - S3-E7
Revealing mistake: When Gill called Kristy she picked up, but if you look at her phone someone is still calling. (00:02:20)
Surf'N Turf/Hardcase Returns - S1-E8
Revealing mistake: In "Hardcase Returns" Skidmark uses a digital phone to track a GPS device installed on Turbo's parade car. When the keypad on it is shown, 3 letters are missing. They could have been on the keys that had nothing written on them, but we will never know for sure because nothing is on them.
Revealing mistake: When the house starts to shake and collapse the picture frames on the table don't move an inch, revealing that it's just the camera shaking.