The viewer learned in the first episode that CHS lived above Oliver who lived above Mabel, with that elevator scene. BUT the opener has CHS in an apartment on the 7th floor, Oliver on 8th, Mabel on 9th--the reverse order and far below CHS' actual apt floor within the series.
Though they played the same character in The Boy from 6B (2021), James Caverly and Nicolas Vitucci have different colored eyes: James has blue eyes and Nicolas has brown.