The video's primary scenes, as well as the following segment of kids talking about firefighters, are recycled from Episode 3981 from earlier 2002.
You got it, Elmo!
Elmo: What's that?
Alan: It's a smoke alarm.
Maria: Alan, look! Is that fried chicken I smell?
In the segment of Elmo and his firefighter friend, Susan Blake, explaining and demonstrating what to do if there's a fire, Elmo is cross-eyed.