What are the differences between the Theatrical Version and the Extended Cut?
Aside from a few short plot lengthenings, about one dozen typical MPAA-cuts, mostly just frames, were reintegrated in the Theatrical Version. Some depictions of bullet and stab wounds were equipped with CGI blood textures, but mostly their quality isn't that good and it doesn't fit to the rest of the action sequences, which are quite bloodless.
All in all, the Extended Cut is a nice bonus to Fast Five but because of the minor changes, which can barely be seen during the action sequences due to the fast cutting, you are well served by the Theatrical Version.
In total the Extended Cut is approx. 70 seconds longer than the Theatrical Version and a detailed comparison between both versions with pictures can be found here.
How much sex, violence, and profanity are in this movie?
For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for Fast Five can be found here.
Is there anything after the credits?
Just before the production credits roll, there is a short scene that takes place in DDS headquarters, Washington D.C. Hobbs is handed a document folder by US customs agent Monica Fuentes (Eva Mendes) and told that he needs to look at it. Monica explains that, at 3am in Berlin, a team of drivers hijacked a military convoy. 'Toretto?' asks Hobbs. Monica says no, then points out a photo of one of the hijackers. It's Letty Ortiz (Michelle Rodriguez), Dom's girlfriend who supposedly was killed in Fast & Furious.