Allison got telekinesis, Lila got laser eyes that are just by coincidence exactly the same as Homelander's from The Boys, and Five as you said started teleporting to the multiverse subway. I also think, though I didn't double check, that Ben used to have tentacles come out of his belly/chest and it changed to come out of his back.
There may have been other changes that I've missed, but I think Diego for example keeps the same power, maybe just a bit powered up.
Their powers changed because the marigold wasn't in them for all those years. Their 'potential powers' within them drifted, and they were only locked in to their new powers when they drank the marigold. In other words, their powers can only change while they don't have them - when they have powers, they stay the same (but can be improved a lot through training as we've seen).
I don't think being mixed with another drink has anything to do with it