When Molly is giving the graduation speech, just before the last lines, the tassel disappears and it appears again when she joins Amy.
Amy and Molly are surprised when their Lyft driver reveals himself to be their principal, but they would've seen his picture and first name when the app matched them with him.
When Molly is in the bathroom with Theo and Triple A Tanner's drawing on the wall changes between shots.
In the first classroom scene 7mins 54 in you can see the two characters (George and Alan) walk onto the stage at the front of the class behind Jared however at 7 mins 57 when it shoots back to Molly sat on the front row you see them walking from the back of class towards the stage.
In the scene where Ms Fine picks them up in her car, the editing is poor and you can tell the scene has been cut together from multiple takes as there isn't great continuity between the actresses's poses etc.
In the graduation sequence, Jared starts to give Molly's speech, which is implied to start the graduation proceedings, but she is the valedictorian. Amy, who is the salutatorian would give the first speech.
When Principal Brown collects Amy and Molly in his car he makes a voice memo on his phone, the noise that is played to signify the start of the recording is the iPhone "siri" (digital personal assistant) alert noise, which would not indicate that the phone was recording (rather waiting for an instruction from the user). In addition to this, Principal Brown does not appear to have an iPhone, this noise would not come from a non-Apple device.