I'm not a fan of fake plants, but I'm glad that you found something that helps you!
I have a keen eye for noticing fake plants in shopping malls and waiting rooms.
The easiest thing to look for is fucked up leaves. A real plant will almost always have some blemished, dead, or decaying leaves. Fake plants always look perfectly green and lush.
If you get up close, you can normally find evidence of injection molding, like seams on the edges of the plastic leaves.
In a space like a waiting room, you can also make inferences based on the available light. Trees cannot grow without significant amounts of light, so unless there's a big skylight in the room, a tree in an office is almost guaranteed to be fake. Vines like Epipremnum aureum and other generic houseplants like Dracaena trifasciata will do fine in the low light conditions of an office or house.