#2 Solksjaer's hesitation
Ever since taking the reins at Old Trafford, Solskjaer has proved to have the Midas touch, as he has taken over an under-performing group of players and molded them into one of the most in-form teams in all of Europe.
A darling of United back in his playing days, the 46-year-old has helped bring back the much yearned-for attacking football to Old Trafford, while also bringing out the best in a host of previously underwhelming players to help United's assault on a top four finish.
As they say, 'all good things must come to an end', and United's long unbeaten domestic run came to a halt at the hands of Arsenal, but what must have been disappointing for United fans was the manner in which their manager surrendered the unbeaten run.
For large spells of the match, United dominated but failed to see their dominance translate into goals and the onus was on Solskjaer to change the system.
However, the Norwegian chose to maintain the same form and shape even when it proved difficult to penetrate the Arsenal rearguard, only making a change in the 71st minute after the hosts had gone 2-0 up.
Most matches are usually decided by tactical switches by managers who are savvy enough to read the game and effect the necessary changes. However, Solskjaer held his cards to his chest for too long and ultimately, this proved to be fatal for the Red Devils.