The 911 operator should never interrupt.
1. Note that the question, "you're there now?" is sensitive to John Carter who did not say "no", but avoiding answering it directly.
3. "to see" is the same as "because", indicating the need to tell why he is doing something rather than report what he is doing.
4. "and her car's still there"; is he there now, and can see that her car is still there, or is he just "heading out there" now?
5. "I'm like really freaking out" now uses two words to modify "freaking out", making it very sensitive. This should question if he really is "freaking out". Again, note focus upon himself and his wellbeing.
What someone tells us in the negative is sensitive. Here he has three things to tell us what she was not doing: not going out "to do anything"; not deceiving, and doesn't, but stops himself or is interrupted.
D: Okay, and you guys didn't have an argument or anything?
J: Not at all.
Broken sentence means missing information.
D: All right. And have you talked to her mom or anybody like that, to see if maybe she's out shopping, or - ?
J: I called her father. The only thing that's not there is her cell phone, which is positive, but she's not answering it. So... and the Sacred Heart Festival is going on right up the street, and there's a lot of questionable people there, and it's just kind of. I'm sorry.
The question is answered, but then he goes beyond the question to talk about the Festival, casting suspicion towards those at it.
Note "I'm sorry" is often found in the language of the guilty, no matter what its usage is. See Casey Anthony
Please note that he did not express concern for the victim.
Please note that he went beyond the realm of the questions.
Please note the greeting, and the phrase, "I'm sorry"
There is enough in this call, by itself, to be concerned that he may be responsible for her disappearance.