Now you can leave out the front door, which was previously blocked by lava. Head outside and use (LT) to activate Inspection Mode. People with a camera icon above their head will take a Selfie with you. Take a Selfie with Mrs. Farnickle.
Note: You can go ahead and enter Butters' house to loot it and use the Toilet. Completing these, and doing well, will help increase your Hero Rank.
Continue to the left outside. You’ll see the Postman struggling with the mailbox. Punch it to get it open, then take a Selfie with the Postman.
With both the Postman and Mrs. Farnickle following you now, many of the kids on this street will now agree to take a Selfie with you. Once you have 4 followers, continue to the right to the next street over to do the next mission, Alternate Universes Collide.