I also found an instance of alternate spelling, which may eventually provide some insight into the phonology of some of these glyphs. Compare the following from page 1 R4:
D CX D IX W CO D C3Q L C I CX D CX D C1FR CURE KB
and the following overlapping passage from page 124 R6:
C3Q L I1G CX D CX D C1FR XB KBAD O I CX CUNW
It appears that the word written L C I in the first line is written L I1G in the second line. It is possible that the two words are synonyms, or that the two glyph sequences are similar in sound. Perhaps I1G represents a palatalized form of C in the presence of I (or something like that).