Your post is very well done in colloquial, idiomatic English. I only have a couple suggestions:

I've heard about an imminent Monty Python's reunion...
Love that kind of satire, the sort of "irreverence" they have towards everything, and great animations too. 

1. Since the shows have already started, the reunion is not "imminent" any more. Unless you mean an imminent reunion for another TV series.

2. For some reason, groups do not get a possessive "'s" when they reunite. So the Rolling Stones reunion, Beatles reunion, etc.

3. Since you mean "irreverence" and nothing else, no need for the quotation marks.

4. "animations" or "animation" could both be correct, but to my (US English) ears if you want to refer to the general quality of animation in a series, just say "animation". Brits may have a different view.

I loved the show, and the movies are great too. Monty Python And The Holy Grail is the best IMHO.

And now, for something completely different...

I've heard about an imminent Monty Python's reunion (you don't need the possessive here, as that would denote "a reunion of Monty Python", which doesn't make grammatical sense; you would only need the possessive if you were to say "an imminent reunion of Monty Python's cast - i.e. the cast of MP)... has anyone already seen the new show in London yet?

I like their tv series very much, and in fact I have been watching them episodes for the second time. actually. (to say 'actually' isn't wrong, but it sounds better to say 'in fact I've been watching' rather than 'I've been watching actually...')

I love that kind of satire, the sort of "irreverence" they have towards everything, and the great animations too. Watching the series I've noticed they have influenced a lot of contemporary comedians, Italians too.. (nouns of nationality are always capitalised in English)

I hope to watch their films soon. (Omitting the personal pronoun is permissable, but it's only done in very informal writing). 

Does anyone like this comedy group?

Congratulations, this is well written and the mistakes are very minor. Well done!