First part of a two part crossover episode with 'Sleepy Hollow' (2013) Dead Men Tell No Tales (2015)
In the beginning of the show, Dr. Hodgins knocks over a pumpkin and sends it rolling into the coffin of the headless body of General Howe, creating the character of The Headless Horseman, foreshadowing the arrival of Ichobod Crane.
T J Thyne who plays Hodgins was in three episodes of Angel.
Laura Spencer, who plays recurring intern character Jessica Warren, also appeared in "Sleepy Hollow", another Fox show, in January 2014.
Most people miss a rather subtle point about this episode. Everyone talks about Sleepy Hollow and Ichabod Crane as if they are real and not coincidental names from the famous work of Washington Irving. This means that in the Bones universe the story The Legend of Sleepy Hollow doesn't exist.