The last one is the big giveaway but it can be hard to spot. Look for things going out of frame or going behind other objects. Do they come back when they should? Have they changed?
For example: there are three people in the background and a bus drives by, obscuring them completely. Are they still there when the bus moves on?
I’ll add another one: multiple vanishing points. As models will pull different parts of images from different sources, perspective can be inconsistent across the image.




Go to a Hifi shop and buy a separate amp and speakers. It’ll do more for your enjoyment of the music than anything else.