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If the conditions for InSAR (little to no vegetation, suitable baseline, no rainfall during image acquisitions,...) are not given, your interferogram will contain noise and artifacts and not produce accurate results. You should keep an eye on the coherence as an indicator for the quality which can be expected from your product. Low coherence will mostly lead to unusable results.

There are great materials on the selection of suitable image pairs provided by ESA: InSAR Principles: Guidelines for SAR Interferometry Processing and Interpretation (ESA TM-19) (especially in Part B)

Please have a look at these slides on InSAR error sources (accessible after free registration).

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