glitch in playback and export

Hello! I am new to using final cut and currently using the trial version. I have a mid 2012 macbook pro with 8 gb of ram and a 2.5 Ghz intel i5. I recently edited a video for a client in the program and I love it! However I am very upset that I am seeing these glitches several times throughout the video. It is VERY noticeable and it is not good. I figured that if I export it, it will go away. It did not. Any ideas? (yes the frame I stopped at makes her face look very strange but that is the glitch)