On January 21st, 2015, Kevin Hart bought out two shows of The Wedding Ringer in a theater near Toledo, Ohio. He then urged his fans to "tell them Kevin Hart sent me." 500 patrons were then treated to a free showing of The Wedding Ringer.
Kevin Hart's character states to Josh Gad that Father McNulty, who is scheduled to perform the ceremony, would recognize Jimmy Callahan as an imposter because the Father was the principal at the Benjamin Rush school. There is a real Benjamin Rush school in Northeast Philadelphia where Hart attended George Washington High School. In addition, Benjamin Rush, a founding father, was born in Kevin Hart's hometown of Philadelphia Pennsylvania.
At the end of the movie when Doug and Jimmy are flying to Tahiti with all the other fake groomsmen plus Nadia and others, Jorge Garcia's character says the last line of the movie "I have a bad feeling about this flight". Jorge Garcia had previously starred in the successful television series Lost where a plane crash lands on an island.