Here's a good article explaining how post-exposure vaccines should be administered: https://www.who.int/ith/vaccines/rabies/en/
It sounds like you're OK as there is a line stating, "any remaining volume should be administered IM at an anatomical site distant from vaccine administration" It is likely that, if the other injections were given in your arm, the final administration in your leg was appropriate.
As I recall the first injection is given into the would. The following injections are given Intramuscularly, as mentioned above.
mkh9