Mindy's lipstick gets messed up when she kisses Dennis - it's all over her chin - but later on in the same scene, when she and Gwen are talking on her phone, it's perfect again without her having a chance to leave the room or fix it.
When Danny is sending Mindy the "Happy Turkey" text, you can see the picture Mindy sent was sent on September 14th at 1:01pm, while Danny's text was sent October 31, 11:20am. This episode takes place on Thanksgiving in late November and at the time the texts were sent, it was nighttime.