Anchor: So vividly did he imagine the massive head turning his way and opening its huge maw that he had to blink to ensure it didn't happen.
Entailed: He saw it so clearly that he had to double check and make sure it wasn't real. 
Contradiction: He was not able to imagine anything. 
Contradiction: Ralphie's Diner is named after a famous basketball star
Contradiction: It is possible to achieve this feat.
Contradiction: He would not have been tickled by me.  
Contradiction: 45 to 50 miles away