1. In the first panel, look at where Shermy's hand meets Patty's. It's drawn just cut off where the two should meet, with a gap defining the separation between the two. In the last panel it's more obviously a case of Patty's hand overlapping Shermy's. Schulz is still playing around with the format. It looks like the cut-off hand thing was viewed as a failed experiment because succeeding strips don't do this.
2. Again, what is up with Snoopy and that flower? Is his head a planter?
3. A romance between Shermy and Patty had been implied in an earlier strip, and here it's developed a little more.