When Monica Hands Out Her Cookies, The Cookies Change Position between shots.
When Matthew And Peter are painting. Matthew gets paint on his pants. The Paint Disappears And Reappears.
When Simon, and Matthew Push John Off The Bed, John's Position changes between shots.
When Peter Knocks Down The Lamp, One Shot, It's Back Up, But When Ralph, The Father Comes In, The Next Shot Has It Down Again.
In The Closing Credits, Kayli Brummer's Character, Apple Bobbing Girl is Accidentally Misplelled All In Lower Case Letters.
When Alan Shows His Egg Tube Project To Matthew On The Bus, An Egg Dropped Without Noticing.
On The DVD, Right After The Credits, A Disclaimer says It's PG, While The Packaging On The DVD Says It's Not Rated.
The bus driver tells Matthew to take the first available seat. He only moves up one seat, but that wasn't the first available seat.
The Clothing/Slang/Hairstyles Are From The Present Time (2015/2016),However, This Movie Takes Place In 1986, As Said By Matthew At The Beginning Of The Movie.
While Monica Stops The Van To Pick Up Matthew After Finn Hanging Up Underwear On The Map, A Modern Day UPS Van Can Be Seen Driving By When The Van Stops.
Matthew and Alan are playing Ping-Pong, This Movie Takes Place In 1986, Ping-Pong Tables Did Not Come Out Until 1988.
The Posters In The Buckley Brothers Room Are Modern Day Posters.
The School Has Modern Decorations From The Present Day (2015/2016) era.
After Morris The Mailman Says, "Well Somebody Did.", Matthew And Peter Both Say, "Simon!" But Only Matthew's Voice Is Heard.
When The Family Finds Out The Pirate Ship Is Destroyed By Finn, Matthew Is Heard Saying, "My Sled Is Gone!" But His Lips Don't move.
When Matthew and Peter Get Locked Out By John, The cameraman's reflection can be seen in the window.
When John hits the floor after being pushed off the top bunk by his brothers, he's supposed to still be asleep but has a smile on his face.
When Earl intervenes in the school fight, little Francie Hagbart (Abigail Baugh) can twice be seen shifting her gaze to the camera.