Short answers, pulled from the story.
Ari Sandel directed Goosebumps 2: Haunted Halloween. He replaced Rob Letterman, who had been attached to the project but left due to his commitment to directing Detective Pikachu for Legendary Entertainment.
Goosebumps 2: Haunted Halloween grossed $93.3 million worldwide, with $46.7 million from the United States and Canada and $46.6 million from international markets. The film was produced on a budget of $35 million.
Rob Letterman left Goosebumps 2: Haunted Halloween because his schedule was committed to directing Detective Pikachu for Legendary Entertainment. Ari Sandel was announced as his replacement in December 2017.
Mick Wingert voiced Slappy in Goosebumps 2: Haunted Halloween. The physical puppetry was handled by Avery Lee Jones.
Jack Black appears in Goosebumps 2: Haunted Halloween as R. L. Stine, though his role went uncredited. His involvement was publicly confirmed by a television spot released on the 24th of September, 2018.
Critical reception was mixed. The film holds a 48% approval rating on Rotten Tomatoes based on 93 reviews and a weighted average of 53 out of 100 on Metacritic. Audiences polled by CinemaScore gave it a B, compared to the A earned by the original Goosebumps.