The impersonation that Bugs Bunny does in the wheelchair is of actor Lionel Barrymore in A Free Soul (1931).
The song Bugs dances to trying to amuse the doctors in the stands is the same one Daffy Duck dances to in Show Biz Bugs (1957).
The title is a spin on the English Easter treat Hot Cross Buns.
The Eureka Hospital Experimental Laboratory, Paul Revere Foundation's slogan of "Hardly a man is now alive," was an allusion to Henry Wadsworth Longfellow's "Paul Revere's Ride" poem.