Why Do Experimental Values Differ from Ideal in Filter Circuits?

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New poster has been reminded to use the Homework Help Template when posting schoolwork questions, and to post only one question per thread.
For my lab I need to explain why my ideal values are different compared to my experimental values. besides things like resistor and capacitor tolerances, what would cause a slightly different output?
 

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Can you give us more details about your lab? All we know right now is that you're working with an electrical circuit that includes resistors and capacitors. We don't even know what you measured or how far off from ideal your numbers were.
 
Input and output impedance?
 
In case of active filters the used active device (transistor, opamp,...) can introduce additional deviations from the ideal response.
This will happen if the limited non-ideal frequency characteristics of the device (frequency-dependent gain) does not allow the envisaged filter characteristics (Quality factor, bandwidth).
 
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