Saving Silverman is a 2001 comedy film directed by Dennis Dugan and starring Jason Biggs, Steve Zahn, Jack Black and Amanda Peet.
 Neil Diamond has a cameo role playing himself.
 In the film, Darren Silverman's longtime friends try to save him from marrying his controlling new girlfriend, whose behavior threatens the friends, their band, and Darren's chance at happiness with his lifelong true love.
Dennis Dugan (born September 5, 1946) is an American actor, director, and comedian.
 He is famous for his partnership with comedic actor Adam Sandler, with whom he directed the films "Happy Gilmore" (1996), "Big Daddy" (1999), "I Now Pronounce You Chuck and Larry" (2007), "You Don't Mess with the Zohan" (2008), "Grown Ups" (2010), "Just Go with It" (2011), "Jack and Jill" (2011), and "Grown Ups 2" (2013).
The Howling is a 1981 American horror film directed by Joe Dante, and starring Dee Wallace, Patrick Macnee, Dennis Dugan, and Robert Picardo.
 Based on the novel of the same name by Gary Brandner, the film follows a television newswoman sent to a remote mountain resort after a fatal incident with a serial killer, unaware that the inhabiting residents are werewolves.
You Don't Mess with the Zohan is a 2008 American political satire comedy film directed by Dennis Dugan and produced by Adam Sandler, who also starred in the film.
 It was the fourth film that included a collaboration of Sandler as actor and Dugan as director.
 The film revolves around Zohan Dvir (Hebrew: זוהן דביר‎ ‎ ), an Israeli counterterrorist army commando who fakes his own death in order to pursue his dream of becoming a hairstylist in New York City.
 The story was written by Adam Sandler, Judd Apatow, and Robert Smigel.
 It was released on June 6, 2008 in the US and on August 15, 2008 in the UK.
 The film grossed $201 million worldwide from a $90 million budget.
National Security is a 2003 action comedy film, directed by Dennis Dugan, starring Martin Lawrence and Steve Zahn.
 In addition to Lawrence and Zahn, "National Security" boasts an additional cast of Bill Duke, Eric Roberts, Colm Feore, Matt McCoy, and others.
Grown Ups is a 2010 American comedy film directed by Dennis Dugan and stars Adam Sandler, Kevin James, Chris Rock, David Spade and Rob Schneider.
 It depicts five friends of a high school basketball team reuniting for a holiday weekend after learning of the passing of their coach.
Stefan "Steve" Ihnat (August 7, 1934 – May 12, 1972) was a Slovakian-born American actor and director.
 He immigrated to Canada when he was five years old, and later became a United States citizen.
Happy Gilmore is a 1996 American sports comedy film directed by Dennis Dugan with music by Mark Mothersbaugh and produced by Robert Simonds.
 It stars Adam Sandler as the title character, an unsuccessful ice hockey player who discovers a newfound talent for golf.
 The screenplay was written by Sandler and Tim Herlihy.
 The film was released in cinemas on February 16, 1996 by Universal Pictures.
 "Happy Gilmore" was a commercial success, earning $41.2 million on a $12 million budget.
 This film was the first of multiple collaborations between Sandler and Dugan.
 The film won an MTV Movie Award for "Best Fight" for Adam Sandler versus Bob Barker.
The Honkers is a 1972 American comedy film directed by Steve Ihnat and written by Steve Ihnat and Stephen Lodge.
 The film stars James Coburn, Lois Nettleton, Slim Pickens, Anne Archer, Richard Anderson and Joan Huntington.
 The film was released on May 17, 1972, by United Artists.
Jack and Jill is a 2011 American comedy film directed by Dennis Dugan, written by Steve Koren and Adam Sandler, and starring Sandler, Katie Holmes, and Al Pacino.
 The film was released on November 11, 2011 by Columbia Pictures.

Question: What did Dennis Dugan and Steve Ihnat have in common?
Answer: actor and director