David Raya made a poor throw out to Mathias Jensen which caused immediate pressure on Arsenal's goal, with a header from Brentford striker Igor Thiago but the Spaniard was able to redeem himself with magnificent save.
Arsenal defender Gabriel, while already on a caution, made a challenge on Brentford winger Dango Ouattara, which resulted in a free-kick without any further punishment.
Arsenal missed the chance to re-establish their six-point lead at the top of the Premier League as an impressive Brentford side held them to a 1-1 draw.
Brentford head coach Keith Andrews feels as Arsenal's Gabriel should've seen a second yellow in the 82nd minute of the match and could've made a difference to the result.
Highlights from the Premier League match between Newcastle and Brentford.
VAR took centre stage for three controversial incidents as Brentford beat Newcastle 3-2 at St James' Park in a dramatic, ding-dong Saturday Night Football encounter.
Former Premier League referee Dermot Gallagher gives his verdict on the big refereeing incidents from the weekend. Watch live on Sky Sports News.
Brentford have released footage that appears to show the ball did go out of play in the build-up to Tammy Abraham's equaliser for Aston Villa, before it was disallowed by VAR.
VAR controversially disallowed Tammy Abraham's equaliser for Aston Villa on his second debut for the club as 10-player Brentford held on for a narrow 1-0 win.
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Our football betting expert Jones Knows provides his insight across the Premier League weekend.
Low blocks are a hot topic in the Premier League.
The winter transfer window opened on January 1 and closes on February 2 at 7pm. Find out who is on the move across the Premier League.
FREE TO WATCH: Highlights from Brentford’s match against Nottingham Forest in the Premier League.
Goals in either half from Igor Jesus and Taiwo Awoniyi saw Nottingham Forest restore their five-point gap above resurgent West Ham and the Premier League relegation zone with a potentially vital 2-0 win at Brentford.