Sydney welds through a metal grate and touches the metal immediately. Unless that was some sort of special CIA cool welder she should have been burned by the hot metal.
After Nadia crashes through a wood and glass wall she returns in a the car with a perfectly intact front.
Chase tells Dixon that Sloane is authorized to contact his former associates. In the previous two episodes he had to step down as APO Director because the situation involved former associates.
One would assume that if Sloane were unable to contact any of his former associates he would be pretty useless at his job. In the previous episodes it was stated that Sloane could not have contact with a select number of his former associates who were on a list, including Anna Espinosa and Sark. It seems that the man he contacted in this episode is not on that list.
When Sydney is picking the lock on the desk drawer, she uses two picks. Lockpicking requires two tools, but one is a pick, and the other is a tension tool, not another pick.
During the scenes which takes place in Brussels all the cars are of American brands.