1965-66 was when the NHL mandated dressing two NHL goalies each game.
You're certain the goalies didn't get a minor injury? My guess is that it's a "stamina" attribute issue with the goalies but I really haven't played many seasons prior to the late 60s expansion yet.
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mid-game goalie changes to ONLY be for injury replacements prior to 1942 (not sure where teams started occasionally dressing backups, but it was pretty much unheard of prior to 1942).
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Very nice suggestion. Prior to '65-66.