Holo-Wesley's appearance was based on a famous painting by Thomas Gainsborough called "The Blue Boy". His costume was copied in detail and references to the painter and the painting can be found in the script.
The episode drew some early controversy as Barclay was perceived by viewers as reflecting a stereotypical Trekkie/Trekker (introverted personality, obsessive traits). Producers have maintained that Barclay was no such reflection, nor was the episode being intended as any sort of statement about the Star Trek fan base.
The original episodic promo for this episode (which can be seen on the season three blu-ray) makes no reference to Barclay or his holodeck addiction but instead focuses entirely on the malfunctions aboard the Enterprise and the invidium contamination.
Miles O'Brien and Worf recall Barclay's holodeck antics in Star Trek: Deep Space Nine episode "Image in the Sand". Although neither character actually witnessed Barclay's holoprogram in this episode, La Forge and Barclay are both referred to by name in that episode.