The high school facade is the repurposed clock tower at Courthouse Square aka the Hill Valley set from Back to The Future (1985).
Ian McKellen is the narrator for the show after taking over the role from Patrick Stewart who was the narrator for the movies. Both were on screen rivals in several entries of X-Men franchise
They use the same bong as the first Ted (2012) movie.
John Bennett, played by Max Burkholder, is 16 years old in the series. However, Burkholder was 25 during filming of the seven episodes, making him almost ten years older than his character.