In the flashback at the beginning of the episode, Henry's father calls him Henry James Dunn when he runs off on the beach with Abby. In the first episode, we can see on Abby's wedding invitation that Henry's middle name is written with a 'W'.
The title of this episode, which is Sigh, refers to the sound Henry Dunn makes after being stabbed by Abby Mills.
Goof: Henry's adoptive father refers to his wife as Karen, but her name is given in the credits as Cheryl.
Goof: Trish's wedding dress is different from the one she showed to her bridesmaids earlier in the season. The first dress had a dark maroon sash. The one she wears in this episode has a cream-colored sash and flowers at the waist.
John Wakefield's victims: Uncle Marty Dunn, Sheriff Charlie Mills, Kelly Seaver, Lucy Daramour, Danny Brooks, Cal Vandeusen, Chloe Carter, Beth Barington, Shane Pierce, Nikki Bolton, Maggie Krell.
Henry's victims: Reverend Fain, Richard Allen, Katherine Wellington, J.D. Dunn, Trish Wellington, Christopher Sullivan, John Wakefield, Cousin Ben, Malcolm Ross.
Christopher 'Sully' Sullivan: He gets a knife in his back.
John Wakefield: He gets stabbed in the chest with a boarding knife. Henry Dunn: He gets a boarding knife through his stomach.
Abby Mills: You destroyed everything I loved.
Henry Dunn: But you have me!
Abby Mills: I don't want you!
Visual Effects Provided By: Entity FX
Post Production Sound: Smart Post Sound
Wedding Video Footage Provided By: David Naylor, Richad Oak
Main Title Design: The Picture Mill
Post Production Services: Technicolor, Vancouver; Modern Videofilm, Inc., Los Angeles
Original International Air Dates:
Norway: Sunday, July 26, 2009 on TV2Zebra
Ireland: Monday, August 31, 2009 on RTE2
Poland: Sunday, September 6, 2009 on AXN
Germany: Wednesday, November 11, 2009 on ProSieben
Finland: Thursday, November 26, 2009 on Nelonen
Czech Republic: Wednesday, April 7, 2010 on Barrandov
Slovakia: Monday, February 20, 2012 on JOJ