As the captain of the Canadian national junior team, Lafrenière led them to a gold medal at the Hlinka Gretzky Cup.

[2] Following the shortened 2019–20 QMJHL season, Lafrenière was considered the consensus first overall pick for the 2020 NHL Entry Draft having led the league in scoring with 112 points.

Lafrenière also became the youngest player in NHL history to score their first career goal in overtime (19 years, 109 days old).

[9] On March 30, 2024, Lafrenière recorded his first NHL career hat trick and five-point game in the Rangers' 8–5 win over the Arizona Coyotes.

[15] In December 2018, Lafrenière was named to Team Canada's 2019 IIHF World Junior Championship roster.

After a four-point performance in the team's 6–4 win against the United States in the tournament opener, Lafrenière suffered a lower-body injury the following game after colliding with Russian goaltender Amir Miftakhov on a scoring chance in the second period.

Despite being a Montreal Canadiens fan growing up, Lafrenière's favorite player is longtime Chicago Blackhawks star forward Patrick Kane.