I'm confident enough to say that the most popular route to Carl Side is via the Ullock Pike and Longside ridge, and, because this path skirts around the northern side of Carl Side, many people don't actually visit the summit. If you approach from White Stones however, it would be extremely difficult to miss the top even in the most dire of visibility.
I'm as guilty as anyone else when I say this, but Carl Side is usually combined with others in the area and simply referred to as one of "the Skiddaw fells". This is a shame to be honest because it really does deserve to be talked about or described as a separate fell.
A little way from the summit is Carlside Tarn, which might not be the most striking tarn in the Lake District, but it is the only one found on (dare I say it) the Skiddaw fells.