Sonic Boom references quite a bit of Sonic the Hedgehog material.
- The athletic tape over Sonic and Tails' shoes hearkens back to the white stripes on the shoes of their game counterparts.
- Tails and Eggman ride hoverboards at one point.
- When Sonic comes close to falling into an abyss at the beginning of the first episode, he does his "balancing at the edge of a platform" pose from the classic games.
- We also see in the same episode two old portraits of Sonic and Tails spending time together. In the first portrait, Sonic looks a bit like his Sonic Adventure design and Tails looks like Classic Tails, even having almost entirely black irises. In the second one, Sonic and Tails look somewhat like their Sonic Adventure 2 selves.
- The last 3 notes of Eggman's theme are exactly the same as the last 3 notes of Robotnik's theme from Adventures of Sonic the Hedgehog. Eggman himself even goes so far as to say "I hate that hedgehog" in "Eggman the Auteur".
- Eggman utters another particularly popular phrase of his AoStH counterpart in "Return of the Buddy Buddy Temple of Doom":Eggman: Ah, Sonic the Hedgehog. Snooping as usual, I see.
- Eggman utters another particularly popular phrase of his AoStH counterpart in "Return of the Buddy Buddy Temple of Doom":
- The description of the game Tails lets Cubot and Orbot play in "Let's Play Musical Friends" sounds a lot like the original Sonic games.
- "Battle of the Boy Bands" isn't the first time Sonic played a triple-necked guitar.
- Eggman's movie in "Eggman the Auteur" has his greatest dream to be... to build a theme park.
- "Cabin Fever" reveals that Tails is still afraid of lightning.
- In "Sole Power", Eggman foils Sonic with special shoes that can't be removed normally, which also happened in Sonic Labyrinth.
- Possibly incidental: in "Fire in a Crowded Workshop", Sonic's false account of Amy's characterization sure sounds a lot like her Sonic Adventure days.
- In "Tommy Thunder, Method Actor", Sonic's battle with the Obliterator Bot has a remix of the Adventures of Sonic the Hedgehog theme playing.
- In "The Biggest Fan", Mark paints a picture of Sonic with tan arms, referencing the appearance of main-series Sonic and how the change in coloration to blue for the side series has been "controversial" for some people.
- Mark also yells "Quiet, Tails!" on two separate occasions, similar to Sonic yelling "SHUT UP, TAILS!" in Sonic the Hedgehog: The Movie.
- Look closely at the Male Fennec's magazine rack in "Unnamed Episode" and you'll see a simplified version of the cover to Sonic the Hedgehog #201.
- In "Give Bees a Chance", Knuckles offers to keep the powerful Fregosi Sapphire, stating his reasons for doing so are because "people have been complaining that I don't guard enough rare stones"; this is, of course, a reference to the fact that most of the other incarnations of Knuckles have a responsibility to guard the Master Emerald.
- The theme music of mainline Eggman, heard in previous Sonic games such as Unleashed and Colors, can be heard during the movie theater scene in "Mombot".
- In "Robots from the Sky" Part 1, Orbot and Cubot suggest better names for Morristown, the city that Mighton and Bolts come from, and Cubot's suggestion is Sky Sanctuary, which is also the name of a zone in Sonic 3 & Knuckles.
- Another classic zone (this time from Sonic 2) is namedropped in "Don't Make Me Angry", specifically Casino Night Zone.
- In "Vector Detector", Vector gets dollar-sign Wingding Eyes while talking about how rich he is, similar to how he reacted to Team Chaotix's mysterious customer promising to "pay handsomely" in Sonic Heroes.
- In "If You Build It, They Will Race", the Egg Mobile merges with a car-like vehicle that can't be driven without it, similar to the first boss of Sonic the Hedgehog 2, the Egg Mobile-D.
