It's missing something in terms of a transition threads. There's no scene where he says to her I'm gonna go play D&D, I'll meet you back here later, or gets a phone call during D&D and says I have to leave the game. Him being in both places feels stuffed together and haphazard, as if they originally had them happen on different nights and then decided to try to do a montage with those two events and the basketball game. Hence bad editing.

Not that this is my only criticism of the show editing wise. Is there thought put into how the separate plots in this episode combine together to create one flow or are cumulative thematically? Is there any meaning from going from "Eddie and cheerleader in the woods" to "Eleven gets bullied" to "Joyce deals with hanging bucket thing" in the span of like 3 minutes. Or is it just we have these separate plots so let's just find some place to put them next to each other. I think if you gave me all the separate plotlines in a Stranger Things episode and asked me to put them together on movie maker I wouldn't do that much worse of a job.