Corrected entry: Rick tells the Asian kid that the gun he has holds 15 bullets, but when Rick hops out of the tank and begins shooting, he only shoots 14 bullets and then the guns hammer locks back, showing that the chamber is empty.
Corrected entry: When Rick is using the binoculars on top of the building to scout out the get-a-way trucks behind the fence for their escape, he is scanning over towards the trucks and fence line, seeing the walkers between them and the fence. In the far distance you can see the highway and a car driving over it, presumably an in-use road not closed for filming that still has people driving as usual in real-life. (00:23:20)
Correction: It is still early in the Apocalypse and people are still using cars and as you pointed out the group is going to use a car to get back to camp. In fact Rick and the group use cars for quite a few seasons, Daryl is still using his motorcycle In season 9. The fact that someone else is also driving is not a mistake.
Corrected entry: When Rick and members of the group are on the roof top looking for a way out of their situation, you can see a car driving by in the lower portion of the screen.
Correction: Not a mistake. We know that (a) there are many other survivors not shown on screen (b) have operating motor vehicles.
Correction: He said how many bullets the gun holds, not how many are currently in the magazine. If he said there were currently 15 bullets in the magazine then your submission would be valid. But since he was talking about how many bullets it can hold, then your submission is not valid.
SAZOO1975