1. Sid is quite pleasantly surprised when he sees Buzz among the spacemen:

A Buzz Lightyear? No way!

And later Woody:

Alright! Double prizes!

2. Sid is a kid, and when kids are offered a free toy, they don't usually question it or stop to think about some slight inconsistencies. They'll just be happy to get any toy.

3. Sid has also been established as a savage boy who only wants toys so he could destroy them. He would care even less about the kind of toy that comes his way.

4. Claw machines contain many kinds of toys and I doubt their maintenance is incredibly rigurous. Some other toys could end up in there, either by accident or intentionally.

So given all of the above, what's the point in stopping the plot and having Sid note that this is weird, when it's not that weird to begin with and doesn't seem like something Sid would wonder anyway? That would seem like a completely superfluous moment, to be honest.

1. Sid is quite pleasantly surprised when he sees Buzz among the spacemen:

A Buzz Lightyear? No way!

And later Woody:

Alright! Double prizes!

2. Sid is a kid, and when kids are offered a free toy, they don't usually question it or stop to think about some slight inconsistencies. They'll just be happy to get any toy.

3. Sid has also been established as a savage boy who only wants toys so he could destroy them. He would care even less about the kind of toy that comes his way.

4. Claw machines contain many kinds of toys and I doubt their maintenance is incredibly rigorous. Some other toys could end up in there, either by accident or intentionally.

So given all of the above, what's the point in stopping the plot and having Sid note that this is weird, when it's not that weird to begin with and doesn't seem like something Sid would wonder anyway? That would seem like a rather superfluous moment, to be honest.