It seems to me that the last track on Recovery, Untitled is just pure lyrical show-offery. Take the follwing line as a prime example...
"Colt Seavers on a mule, stunting on that ass,
Like a fuckin' fall guy"
Colt Seavers was a character in a TV show called 'The Fall Guy', which was all about the character of Seavers playing a stuntman. So, 'stunting on that ass' (slang for showing off) is a play on the first line; being a stuntman (Colt Seavers) on a mule. Also note the continuous equine imagery. Eminem gives us 'Colt' (a young male horse under the age of four), mule, ass and also - for the more discerning ear - the play on words of fall/foal (the young offspring of a horse)
Just noticed it today and thought I'd share for anyone who wasn't aware of it.