The design on Lanny's souvenir T-shirts are almost identical to designs used by Fidel Castro, tyrannical dictator of Cuba from 1959 to 2008.
When Boomer jumps to try and capture the gopher, he lets out a very familiar scream. The sound effect used is known as the Wilhelm Scream, originating from the film Distant Drums (1951). Its use is so common, it serves as an inside joke for those working in the film and television industries.