I don't have my files in order atm, and there isn't any organized location for them on the net, so I will only point out a few from Bioflames that are third era.

Elza's first publicly shown in-game model. A little blockier, note the ponytail is wonky. Textures not as detailed.

Third era is also the first time the firing range was shown. And it had 8 stalls instead of 4 like in the later eras.

German Shepherd zombie dog.

Fat cop zombies were in the lobby. Fourth era and onward they were removed since the event where the zombies outside the front gate break in and only civilian and regular cop zombies crawl in.
There are more images scattered about of the third era, and there are other differences as well. If I can remember to get around to it, I'll post the list.
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