Episode #3.3 - S3-E3
Audio problem: In a conversation with Colin, Zoë says "What is the point of it being able to do all this stuff if we can't see the results?" The camera then cuts away from her face, she continues "We need to find out who [name I won't embarrass myself by misspelling] is talking to." This line has been dubbed in, as it is said while the actress' face is off-screen and in a completely different tone of voice. (00:35:30)
Episode #3.5 - S3-E5
Continuity mistake: Danny is on the range firing a chrome/silver Beretta pistol. The other agent on the range takes it from him, but when he is shown shooting it has changed to a black Glock. When he hands it back it has become a Beretta again.
Answer: They no longer exist. The Military Intelligence groups first appeared at around the time of the First World War. MI-1 was the original directorate, MI-2 dealt with the Soviet Union and Scandinavia, MI-3 with Germany and Eastern Europe, MI-4 handled aerial intelligence gathering, MI-7 dealt with propaganda, MI-8 with communication intercepts, MI-9 with covert operations, MI-10 were the technical experts, MI-11 dealt with security issues out in the field and so on and so forth. All these departments have either been shut down or subsumed into the Security Service, informally referred to by its original designation of MI-5, the Secret Intelligence Service, referred to as MI-6, or GCHQ, the Government Communications Headquarters.
Tailkinker ★