Angela says that it's "birthday month," and states that Kelly's, Creed's, Oscar's and Meredith's birthdays are all in that same month, in that order. But in The Alliance (2005) Pam stated that there are no staff birthdays coming up in the next month: Meredith's is the next one, and it's a month away.
Towards the end of Michael's "wilderness retreat", Michael is seen eating (presumably) poison mushrooms, through the lens of his video camera. In tandem, Dwight emerges from the woods to tackle and prevent Michael from eating the potentially lethal snack. As they are both falling to the ground, the camcorder is knocked out of Michael's hand onto the ground. In the very next shot, the camera is shown still gripped to Michael's hand.
When Michael surprises Phyllis in her car, you can see Phyllis laughing. She even smiles before Michael says anything.