When Michael hugs Toby, his wristwatch reads 5:25. In the very next scene, when they walk into the main office area, the clock on the wall shows 3:20.
There is a discrepancy as to whether Dwight's mother is actually dead or alive. Here, he comments on Michael dating an employee's mother and relates his wish to introduce Michael to his own mother for a date. In Goodbye, Toby (2008), Jim supposedly talks to Dwight's mother on the phone. However, in Fun Run (2007), Dwight describes his mother's burial plot to Angela - meaning she is dead.
Both Ryan and Kelly talk about Ryan's new hat being a fedora, it's actually a trilby.
Segway riding is not recommended/suitable for pregnant women, yet Pam & Jim fondly remember their Segway tour. No tour operator would allow her on their tour, especially not in a place like Puerto Rico.