In the first episode, Fiona Banks was introduced as being from Scotland Yard, but in this episode it is stated that she is with MI6.
When the agents race to the roof to save Al, Fiona Banks is with them. In a wide shot later in the scene, only Al, Mark, Demetri and Stan are there.
In episode 1.6 when Demetri finds the first members of the Blue Hands Club, he shows the camera Ian Rutherford's passport which clearly states he was born in Dec 1985 - later in episode 1.7 the MI6 Agent Fiona Banks states Rutherford was born in 1984.
After Nicole calms down a Japanese lady in the hospital over a potted plant being in her room in Japanese, she explains to the staff that "Sweet Peas symbolize 'goodbye' in Japanese culture." However, the sentiment isn't that it symbolizes "goodbye", but there is a superstition that because the plant is in the ground that it would carry the sentiment that the patient will be put in the ground as well. And this applies to all plants that are potted, not just Sweet Peas.
The newspapers report the suicide as proof that the future could be changed. Anyone with common sense would realize that someone that had a vision committing suicide would be possible at any time, so they would arrive at the same conclusion without anyone killing themselves. Coupling this with suicide data in the U.S.A. from 2008, where 1 person killed themselves every 14.6 minutes, makes it very likely someone that had a vision would kill themselves anyway, making the agent's suicide needless.
During their shared flash forward, Gough and Agent Banks are shown in the MI6 offices, sitting in front of a window out of which the London Eye and the Houses of Parliament can clearly be seen. These constructions, however, are both almost two miles downriver from the MI6 building.