My groups just have a house rule that if the GM screwed up a rules call earlier and we're just now realizing it, then that was the rule for that one instance. Moving on. My players are generally very story oriented, so they're more interested in keeping the plot going than staying perfectly in sync with the mechanics. Which works for me.That was just a random example. DMs are as capable of making mistakes as players. The question is if they made an unintentional mistake, or have they purposefully modified something? A private message addresses the former without stepping all over the latter in front of everybody else and wasting time.
I've been doing sessions over Discord the last few months for obvious reasons, but at a table I never took to using a laptop. I prefer to go analog. If for no other reason than you can drop a notebook on the floor and it will still work.