Did we fall for rotation re blackboard text?

So I was rewatching and noticed that the text on the blackboard is mirrored in Petscop 23 compared to the casket. (Looks mirrored vertically to me).

I know a great deal of time and effort was spent trying to decipher the casket text. Did we spend as much time trying to decipher it if it was mirrored… 1. Vertically 2. Horizontally and 3. Both?

Like in Petscop 8 when Paul chases Marvin and goes the wrong way because the staircase is rotated, we may have gone whole hog in the wrong direction here too.