“I think there is someone he likes, because he has been acting…weird” IS significant. You’re supposed to take notice of it. Because it’s how Mike Wheeler acts the whole season.
After @doriandrifting ‘s time theory I’ve noticed both Byler & Lumax have matching watches - Will and Lucas on the left hand, Mike and Max on the right hand. Max got vecna’d, is it Mike’s turn in s5?
Another observation - only two more people wear their watches on the right hand. Barbara in s1 and Billy in s2. Both of them were Vecna’s targets.
And I feel like this scene is somehow important. We know that in that moment Max is already Vecna’s turget and it is interesting that the Dufferts want to show us it’s MIKE who notices something is wrong with her. Why not Lucas? Or Dustin? WHY MIKE? And watches, their watches right in the focus!!!
So, you know what? Keep growing up kid. Don't let me stop you. Make mistakes, learn from 'em, and when life hurts you, because it will, remember the hurt. The hurt is good. It means you're out of that cave. But, please, if you don't mind, for the sake of your poor old dad,