Visible crew/equipment: When Abby is going through the garbage to disprove Tim's sister you can see a crew member's foot in the screen- it's a brown boot.
Continuity mistake: During the scene where Tim and sister Sarah are working on the past evening's timeline, Sarah's clothes lying on the counter change position between the wide shots and the close-ups. Also the plastic her shoes are sitting on in the wide shots disappears in the close-up when she removes them and when she picks up the baggie of money. The screen shot of the locations in the time line also change locations. The 9:30 and 10:00 individual locations show up in the Georgetown University area but when they zoom out to show all three locations, the two time location now show the George Washington University, Foggy Bottom area of D. C., and it shows Tim's residence as being in Arlington National Cemetery. (00:06:35 - 00:07:50)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.