Crystal Palace struggled to deal with Huddersfield's intensity throughout the encounter and David Wagner will be hoping his side can build on this excellent start to the season in the Terriers upcoming fixtures. This team did not look impressive but did enough to get the spot in the Premier League.
De Boer has taken over with no experience of English football, but having managed Ajax and Inter.
"This was a very poor start for everyone (at Palace)", he said.
The Eagles began to throw caution to the wind as the game progressed but Mounie's second with 12 minutes to play ended any chance of a fight back from the home side.
The Eagles faithful will be hopeful they can perform better than their last campaign, where the prospect of relegation to the Championship seemed a reality, however with a new manager at the helm, things could be on the up for the south London club.
The first came via the foot of Palace defender Joel Ward after Mathias Zanka had returned Christopher Schuindler's flick-on from an Aaron Mooy corner back into the six yard box.
It didn't take long for Huddersfield to double their advantage.
Welcome to the @premierleague, Steve Mounié!
Palace did improve after the break and Christian Benteke saw a headed effort well saved by visiting keeper Jonas Lossl 10 minutes after the restart.
Jairo Riedewald, Ruben Loftus-Cheek and Timothy Fosu-Mensah have all recently arrived at Selhurst Park and it has been confirmed all three have been included in the matchday squad for the visit of the Terriers.
Both Frank de Boer and David Wagner will be taking charge of their first Premier League games in this match, only the second time in the last 13 seasons that two managers face one another in their maiden games, with the other occurrence coming on last season's opening day between Claude Puel and Walter Mazzarri.
Since 2008-09, only four newly promoted sides have won on the opening day in the Premier League - but all, like Huddersfield, had won promotion via the play-offs; Hull in 2008 and 2016, Blackpool in 2010 and West Ham in 2012.
For every way in which it may have been wonderful for Wagner, it would have been a concern for De Boer.