I think both sides could benefit from re-watching the first 45 minutes of the game, if you can find the time or interest to do so. With the anxiety, anticipation and excitement now eliminated, you might have new / different observations.
Here's the link for that. Bloodzeed HD quality FTW:
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http://www.fullmatchesandshows.com/2015/08/24/arsenal-vs-liverpool-highlights-full-match/#4
After watching that clip, I think dmish's observations of the lack of team pressing in the first half are mainly correct, though it was not zero.
I counted about 3 occasions which would qualify as team presses - e.g. one man (or two) gets on the opponent with the ball, while team mates either push hard against the possible recipients for a pass, or guard/attack the passing lanes radiating from the guy to his team mates. One of those presses was at about the 20th or 21st minute mark which led to Benteke getting the ball and being cleanly tackled by Coquelin right outside the box. On that occasion, we pressed Cazorla, who coughed it up under pressure and went down claiming a foul (quelle surprise). The other two occasions - we won the ball on one in our half and I think created a long ball to Benteke or Coutinho to attack, and on the other, in their half, they beat the press but their outlet pass was long and out to touch (or their guy was offside) and we took possession.
So, as far as pressing as a team goes - we didn't press as a team for the first half much, but neither did we not press at all.
Unrelated to this, regarding dmish's observations in the post-match thread breaking the first half into 2 blocks of 20/25 minutes, I see it somewhat differently. After re-watching the video, I'd say it breaks down like this instead:
First 10 minutes - we were under pressure, and this was the period when we looked likely to concede (and we did; lucky to get away there).
Next 10 minutes - drifting game
Next 10 minutes - we were now on top; two of those team presses I mentioned came about during this period IIRC (at least one of them did)
Next 5 minutes - drifting game
Next 10 minutes - we were back on top again but team pressing wasn't a feature here
Bellerin and Chambers were very poor when we were dominant, but not everything was due to them. Benteke, Coutinho, Firmino and Milner operated very smoothly during those periods with their runs at the opponents, passes and/or breaks from deep, and Arsenal's mental fragility just caused them to panic, as expected. Maybe we could have induced a longer state of shock with more aggressive team pressing, but this early in the season, with almost all 5 guys (including Can) being strangers to each other, the manager and the tactics at the club, I'm not really sure it'd be reasonable to expect them to repeat the days of 13/14.
I don't think we were ever in danger of conceding after the first 10 minutes; we looked very organized defensively, and while they had a few corners, we dealt with them well. We had to stretch for a couple of clearances (I think on the break usually), or had a couple of instances when the ball fell kindly for us due to an overweighted / skidding through pass or two. This is Arsenal we're playing - they're bound to test your nerves a few times with some of those. In the main, we had them under control for 35 minutes of the first 45, at the Emirates, which is excellent.
Then again, perhaps I'll watch the clip again later and have another completely different set of conclusions.
😉