- Angel Island is the first location from the Sonic the Hedgehog game series to be mentioned in the Sonic Boom franchise.
- According to an interview with Bill Freiberger, the writers of the show only wanted to mention Angel Island to acknowledge that is where Knuckles comes from, and as such have no stories planned to include the location.
- ↑ Pugsley, Tom; Denton, Alan; Hahn, Greg (31 January 2015). "Cowbot". Sonic Boom. Season 1. Episode 11. Cartoon Network.
- ↑ Raut-Sieuzac, Natalys (28 January 2017). "Knuck Knuck! Who's Here?". Sonic Boom. Season 2. Episode 64. Boomerang.
- ↑ Matt Santori-Griffith (23 February 2015). Inteview: SONIC Goes BOOM with Bill Freiberger. Cosmicosity. Retrieved on 24 February 2015.
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