Frank mentions that he's 64 years old, however several seasons earlier in "The Gift", Frank celebrates his 65th birthday.
Debra gets angry and pours tomato sauce into Ray's lap and Ray leaves the kitchen. Marie comes over and Ray re-enters the room, still with sauce stains on his pants. However, when Marie makes Ray take his pants off to wash them, his boxer shorts underneath are completely clean. The tomato sauce should have soaked through and stained them as well. Apparently, when Ray went offstage, he changed into clean boxer shorts.