During the stakeout in the park, the collar on Gibbs' shirt switches back and forth from under his jacket to over his jacket depending on the camera angle.
As Tony was bearing his soul to Gibbs about his issues with his father and Zoe, Bishop cuts in over the walkie talkie to tell him that his mic was open. If Tony's walkie talkie was transmitting everything he said, Bishop would not have been able to transmit anything until the talk button on Tony's walkie talkie was released.
The statement 'grew up in southern Pennsylvania' would never be said by someone in DC or in the Midlantic states. People refer to living in southeastern, southcentral, northwestern or central PA etc. However, Bishop, who said it, is from Oklahoma, not an Atlantic state, and so this can be overlooked.