Posted by: @fantasia

For the record, I don't know a single American who grew up with these shows who was confused. It aired on TV with the description of each episode listed in the TV Guide in our newspaper.  But perhaps you're referring to later on when the series was released on VHS tapes or DVDs? And if so, I can see how there would be some confusion if you're not familiar with the original releases, and I don't think that's going to be limited to Americans.  

ETA: I just saw Narnian78's comments about the release at night as one big, long showing (sorry i missed that). I have no memory of that myself. My family and I watched it during the day with each episode being shown one at a time per day, on PBS if I recall correctly. 

@fantasia Clearly what I have read from Americans on here and the old Into The Wardrobe forums is not your experience.

May I just diverge from the topic while I clarify? -

I know that not all Americans call them the BBC serials (Col Klink called them Wonderworks, above). But worldwide they are mostly called the BBC adaptations/serials, in my experience.
There are three stories in the BBC  adaptations: LWW, PC/VDT, and SC.  Each was made as a serial of six episodes.
If the story is continuous, but shown in sections on more than one day, we call it a serial. If it has a set of episodes each with its own topic or story, we call it a series.
If the six episodes of one serial are shown in quick succession (or two or three in each screening), this seems to be called a miniseries in USA. In Britain this term would refer to no more than four episodes; six would count as a series.
Some people in US seem more used to the whole of each story shown at once, giving nearly three hours of continuous story. All my recordings (VHS & DVD) are episodic.

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@fantasia 

I think that the total length of Prince Caspian and the Voyage of the Dawn Treader was about two hours and 45 minutes with only about one hour devoted to Prince Caspian and the rest to Dawn Treader.  I guess the reason for Prince Caspian being so short was lack of money. It is really a shame that it was so short, but I would have liked both stories to have been at least two and a half hours or more.  Dawn Treader was actually quite a good adaptation, considering the limited time and resources that BBC had available.  
I was thankful for Wonderworks and PBS bringing these children’s dramas to the screen even if they were shortened, but it is sad that more money was not available for a better and longer production of both stories. Wonderworks was the name of the PBS series of children’s dramas, which also included some American and Canadian series such as Anne of Green Gables.

Here is some more information:

https://en.m.wikipedia.org/wiki/WonderWorks