The mention of Mormonism as one of the religions that will "spill theirs just anywhere" in "Every Sperm Is Sacred" was ironically funny to those in the know at the time, since the publicly expressed attitudes of senior church leaders towards birth control were almost identical to the Catholic view (for different theological reasons, though). In recent years, however, the LDS Church has clarified its birth control position, stating that couples aren't restricted from using contraception, thus making them (slightly) more lax on the topic than Roman Catholicism.
Nowadays, people will say that Graham Chapman wearing the corset and white wig in "Find the Fish" reminds them of Lady Gaga.
Mr. Creosote serves as this both within and without the film. With the bath tubs of dairy based vomit FX going off by day three or so of shooting, he even began to affect the filmmakers themselves... In fact, if you look closely after he explodes, you can see several extras throwing up as they leave.