I think its intentional, they've done it before (I forgot which route but it was when walter was leaving school and met talbot and he said something that I dont even remember lol but the point is I'm pretty sure its not a bug)
I saw this too, Walter confronted Talbot I think(?), even the text box of Walter glitched(I don't remember what Walter did though), and if I remember, he said "I hate him, hate him" until he is in Bublix or something.
and a Background glitch on Mark's route, around day 2(Morning in Playground), saw some glitches, its like Rays of lights.