Spoilers for Joker

Here I am typing a bunch of filler text because Twitter automatically embeds the first but of text into the tweet even though I am deliberately posting it this way to avoid sharing spoilers.

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Am I remembering correctly that in the train shooting, with the three suits who Joker shoots dead, there are seven bullets fired that we see/hear, but the gun is the type of gun that only holds six bullets (and I think is shown to only hold six earlier in the film).