When Sophia gets out of the shower, she's dripping wet, her hair is soaked, but as she walks over to get a towel, the camera cuts to a different angle of her from behind and hair and body are completely dry. As she starts to towel off, her hair is suddenly wet again.
Beth drops the invitations on the puddle, then appear over the grass, and then Zoe picks them up from the puddle.
When Sophia is being beaten after tripping in the hall you can clearly see a manicured thumbnail holding onto the object used to beat her to death during the second swing.