From what I learnt and my experience in trading futures, the trendline you see in price could be one bar behind the trendline you would obtain through drawing from indicators. Basically, you could get one bar ahead if you get correct trendlines drawn from some indicators. Also, stocks could trade in trading range and sideways. There are a lot of discussions on this topic over Woodie's CCI club.
Here is an example on GOOG:
My program automatically draw trendlines, can you see the difference between the two charts?
Trendline drawn from the price:
Trendline drawn from CCI and reflected in the price chart:
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