I came across this post on Gab, with this picture
The Nashville shooter's shoes changed.
I decided to check the video myself. On this school surveillance video, at 1:32, you can clearly see the shooter wearing one type of shoes. On this police bodycam footage video, at 5:57, the shooter is clearly wearing a different pair of shoes.
Possible false flag.
From a conspiracy perspective, different shoes would suggest the possibility of the event not having been filmed as presented — in other words, the possibility that the entirety of the film, which is said to cover a time span of less than a half hour, was possibly filmed on different days.
Also, from an overall generic conspiracy perspective — going as far back as a decade or more, & over multiple tragic public events — a lot of conspiracy-minded people have developed the strong belief that shoes are a sign/symbol that it’s fake.