The audio wasn't very good, I'll improve it next time. Yes the ferals get stuck in the car door. I believe it's because of some of the mods I'm using. I don't know of a solution yet, but it's not intentional.
Some of the mods used:
mgdc's Increase Zombies (Hard Version)
ZengerGarden's Tough Cars
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Is there any other tutorial you need? Tell me in the comments.