- Strong aficionado for USA-made muscle cars; he had six as of the last count.
- His sister, Michelle Casey, was in an episode of Settimo cielo (1996) with him ("With a Little Help From My Friends").
- Graduated from the University of Southern California's School of Cinema-Television (Cinema Critical Studies) in 2007.
- The middle child of five siblings born to Darren James Gallagher and Elena Lopez (of Irish and Cuban backgrounds, respectively) and a stepson of Vincent Casey, David Gallagher has two younger brothers, Killian (who is autistic, which is why David is a devoted member and spokesperson of the organization CAN/Cure Autism Now) and Kyle Casey and two younger sisters, Michelle Casey and Kelly Casey.
- Decided not to return for the 11 season of 7th Heaven, on the CW Network (giugno 2006)
- He has been in two movies with John Travolta: Senti chi parla adesso! (1993) and Phenomenon (1996).
- He is a week older than actor Jake Richardson who played Johnny Morton in the episode Johnny Get Your Gun (1998).
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