This episode marks the first time Mulder says the famous line: "I want to believe".
The huge portrait of Ruby that Kevin draws was originally done via a computer printout. However, it looked a little too perfect so art department member Vivien Nishi painstakingly wrote out all the 1s and 0s by hand. This took her several days for a shot that lasted a few seconds on screen.
Joel Palmer, who plays young Kevin, reappears in the series in Season 2 in the possession episode, The Calusari (1995).
This is the first episode in which Mulder fires a gun. He uses it to scare off some wolves.
In the file about Samantha shown to Scully by her boss, the complete is Samantha T. Mulder. Later in the series it is revealed her second name was Ann.