Possible correlations for further investigation:
3 main characters in each story (though Seympour could be arguably a main character though he does not apppear... perhaps he is the glass menagerie...)
Bessie and Amanda (the only version of an overbearing mother in Slainger that I can recall)
Zooey and Tom (Acting and moviegoing as scapist motifs)
Franny and Laura (Franny's spiritual crisis and state of "brokenness" and Laura's physical injury)
This could be interesting fodder for potential investigation....