- Actor Allusion:
- In episode 3, a doctor tells Ivan (Dimo Alexiev) that he's consulted a doctor from Sofia, Dr. Genadiev, about his condition. This just so happens to be the name of Dimo Alexiev's character from another series, Otkradnat Jivot ("Stolen Life"). The series also stars Vassil Banov (Dimitar Sr.)
- Daria Hadjiiska (Ralitsa) is best known for starring in Step by Step Spiritual Successor Us, Ours and Yours, playing the sister of a character named Desi. Here, her character Ralitsa is best friends with a girl with that name.
- Actor/Role Confusion: Both of the youngest stars of the series said in an interview that they have been called by their characters' names, most notably Ronaldo's actor for whom this is a first television role.
- Name's the Same: The mayor, Dobrolyub Dobrev, shares his first name with one of the boys from Spiritual Predecessor War of the Hedgehogs. Knowing that inspiration for this series was drawn from this book (and its TV adaptation), it's plausible that this is not a coincidence.
- Real-Life Relative: Deyan Donkov's (Vassil) son appears as an extra, a rival team member.
- Unbuilt Casting Type: Martin Paunov, who portrays the Titan, is known to be an Adorably Precocious Child himself and his other best-known role was also a kid genius (in 2018 made-for-TV movie The Curie Case). However, Titan has more characteristics typical to the average 10-year-old than his Curie Case character Tony Petrov.
Trivia / Rumbata, Ronaldo and I