Yes, there is a crooked "h" at the end of the first alleluia. It appears to have fallen off of the "Hig Priest" from the year B second reading above. I'm a physics teacher who teaches universal gravitation, and I did layout for a regional magazine back in high school: I'd explain how gravity can affect typesetting but it'd get too technical. ;)
I recall seeing that and wondering. I think I ran into a similar symbol in Musica Enchiriadis, although the printer error sounds much more likely an explanation!
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