When Peter is in the lunchroom with his friends talking about the note declaring war, he states "He read it, it was on his desk unfolded." The note was delivered flat under the door, without any folds.
When the 8th grade monster is shown the dumpster it is full. When he is thrown in there is no trash at the top and it is noticeable how far he can drop in.
When Ed is being chased around the bedroom by the snake, he is barefoot. When he's hanging outside the window, he has on his slippers.
When Ed is injured at the grocery store, he grabs his right knee. When Sally comes to visit him and he arrives at her house, Ed is limping on his left leg.
When Ed is hanging from the roof after escaping from the snake, his pants fall down to his ankles. In the next shot, they fall again.
Ed uses a drone to listen in on his grandson's conversation by hovering it outside his bedroom window. Not only do drones not have microphones, as there are generally not many sounds that can be recorded hundreds of feet in the air, but even if Ed had installed his own microphone, it would have been useless over the sound of the drone and through a pane of glass.
Ed demonstrates his ignorance of simple electronic devices, such as the self-checkout, an iPad and a drone. Yet he somehow manages to log on to his grandson's (presumably password protected) computer, find the game his grandson has been playing, enter it, locate and subsequently destroy the castle he has been building for 3 years.
After the many accidents at the birthday party, Sally is angry with Ed citing the 'war' as being the cause of all the events that transpired. However, almost everything major that happened at that event (with the exception of the ejector seat chair) started as a direct result of a rat chewing through a cable and not connected with the war at all, therefore not his or his grandson's fault.
Ed is told at Jerry's friend's funeral that he died in his sleep while skydiving. While this is a funny joke, in real life all parachutes for sport jumping are equipped with an automatic activation device, designed to activate the parachute to open if the user become unconscious or is otherwise unable to deploy the parachute when getting too close to the ground.
Ed tells his granddaughter that "Pretty much every foundation I dug, I found a marble or two" and "if you count all those marbles [in the glass jar] you will know how many houses I built."
"Pretty much" implies that he did not find a marble at the start of every house, and for the others he found "one or two" which means he found one, two (or more). Circumstances which would not give even a rough count of the number of houses he built, let alone an accurate one.
"Pretty much" implies that he did not find a marble at the start of every house, and for the others he found "one or two" which means he found one, two (or more). Circumstances which would not give even a rough count of the number of houses he built, let alone an accurate one.