Two days after the friend of a late “Toy Story” writer revealed a previously untold and devastating story about Andy’s dad, another Pixar writer has lashed out on Twitter calling it “utterly” false. Let’s back up. This week, YouTuber Jonathan Carlin of Super Carlin Brothers published his video interview with Mike Mozart, a toy designer who was friends with Joe Ranft, the Pixar head writer who co-wrote “Toy Story.” According to Carlin’s interview, which went viral this week, Mozart said that Ranft had revealed to him why Andy’s dad was suspiciously absent from the film over lunch.